diff --git a/docs/version_history.rst b/docs/version_history.rst
index 865dbd6..317d40c 100644
--- a/docs/version_history.rst
+++ b/docs/version_history.rst
@@ -3,6 +3,9 @@ Version History
 
 v0.2.x release series
 ---------------------
+0.2.10 (2020.09.08):
+	- debug ValueError when MD tag of read is missing (`issue #5<https://github.com/parklab/bamsnap/issues/5>`_)
+
 0.2.9 (2020.09.03):
 	- add ``insert_size_del_threshold`` for deletion, ``insert_size_ins_threshold`` for insertsion
 	- add ``read_color_deletion`` for deletion, ``read_color_insersion`` for insertion
diff --git a/pack.sh b/pack.sh
index 7a21300..fc442d7 100755
--- a/pack.sh
+++ b/pack.sh
@@ -2,5 +2,5 @@ pip uninstall -y bamsnap
 rm -rf build
 rm -rf ./dist/*
 python3 setup.py sdist bdist_wheel
-pip install ./dist/bamsnap-0.2.9-py3-none-any.whl
+pip install ./dist/bamsnap-0.2.10-py3-none-any.whl
 # twine upload dist/*
\ No newline at end of file
diff --git a/setup.py b/setup.py
index 28a3cae..6866fbe 100644
--- a/setup.py
+++ b/setup.py
@@ -20,7 +20,7 @@
 }
 
 setup(name='bamsnap',
-      version='0.2.9',
+      version='0.2.10',
       url='https://github.com/danielmsk/bamsnap',
       license='MIT',
       author='Daniel Minseok Kwon',
diff --git a/src/bamsnap.egg-info/PKG-INFO b/src/bamsnap.egg-info/PKG-INFO
index 81c36e2..c8cf6e3 100644
--- a/src/bamsnap.egg-info/PKG-INFO
+++ b/src/bamsnap.egg-info/PKG-INFO
@@ -1,13 +1,13 @@
 Metadata-Version: 2.1
 Name: bamsnap
-Version: 0.2.9
+Version: 0.2.10
 Summary: A converter from .bam to .png for specific genomic region.
 Home-page: https://github.com/danielmsk/bamsnap
 Author: Daniel Minseok Kwon
 Author-email: daniel.minseok.kwon@gmail.com
 License: MIT
 Download-URL: https://github.com/danielmsk/bamsnap/archive/0.1.tar.gz
-Description: # <img src="https://bampdx.com/wp-content/uploads/2015/12/BAMPDX-logo.png" height=28px width=45px>&nbsp;BAMsnap
+Description: # BamSnap
         <!--[![Build Status](https://travis-ci.org/bamsnap/bamsnap.svg?branch=develop)](https://travis-ci.org/bamsnap/bamsnap) 
         [![Code Health](https://landscape.io/github/bamsnap/bamsnap/develop/landscape.svg?style=flat)](https://landscape.io/github/bamsnap/bamsnap/develop) 
         [![Coverage Status](https://img.shields.io/codecov/c/github/bamsnap/bamsnap/develop.svg)](https://codecov.io/github/bamsnap/bamsnap?branch=develop)-->
@@ -36,6 +36,8 @@ Description: # <img src="https://bampdx.com/wp-content/uploads/2015/12/BAMPDX-lo
         ```bash
         pip install bamsnap
         ```
+        * [pypi site for bamsnap](https://pypi.org/project/bamsnap/)
+        
         ### Install with github
         
         ```
@@ -54,6 +56,10 @@ Description: # <img src="https://bampdx.com/wp-content/uploads/2015/12/BAMPDX-lo
         For more details, see BamSnap [**Documentation**](http://bamsnap.readthedocs.io/en/latest).
         
         
+        ## Example Use Case
+        
+        * [**1000 Genome Data**](http://100.26.138.46:8000/): 1000 genomic loci in 2504 individuals
+        * [**BamSnap Plot Gallery**](https://bamsnap.readthedocs.io/en/latest/gallery.html)
         
         
         
diff --git a/src/bamsnap/__pycache__/drawread.cpython-37.pyc b/src/bamsnap/__pycache__/drawread.cpython-37.pyc
index 374c966..8a2abc4 100644
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diff --git a/src/bamsnap/__pycache__/drawreadset.cpython-37.pyc b/src/bamsnap/__pycache__/drawreadset.cpython-37.pyc
index 529428d..1572f75 100644
Binary files a/src/bamsnap/__pycache__/drawreadset.cpython-37.pyc and b/src/bamsnap/__pycache__/drawreadset.cpython-37.pyc differ
diff --git a/src/bamsnap/data/conf.json b/src/bamsnap/data/conf.json
index e3ebc1e..d8d1cf5 100644
--- a/src/bamsnap/data/conf.json
+++ b/src/bamsnap/data/conf.json
@@ -1,7 +1,7 @@
 {
     "TITLE":"BAMSNAP",
-    "VERSION":"0.2.9",
-    "VERSION_DATE":"2020-09-03",
+    "VERSION":"0.2.10",
+    "VERSION_DATE":"2020-09-07",
     "PROG":"bamsnap",
     "options":[
         {"param":"bam", "default":[], "nargs":"*", "action": null, "choices":null, "type":null, "help":"bam file(s)"},
diff --git a/src/bamsnap/drawread.py b/src/bamsnap/drawread.py
index 7f94b77..63551fc 100644
--- a/src/bamsnap/drawread.py
+++ b/src/bamsnap/drawread.py
@@ -21,7 +21,7 @@ class DrawRead():
     y1 = 0
     opt = {}
 
-    def __init__(self, a):  # a:alignment
+    def __init__(self, a, refseq=""):  # a:alignment
         self.a = a
         self.mapq = a.mapq
         self.id = a.query_name
@@ -35,7 +35,11 @@ def __init__(self, a):  # a:alignment
         self.readseq_with_softclipped = a.query_sequence
         
         self.base_qual = a.query_qualities
-        self.refseq = a.get_reference_sequence()
+        self.refseq = refseq
+        # try:
+        #     self.refseq = a.get_reference_sequence()
+        # except ValueError:
+        #     self.refseq = {}
         self.g_spos = a.positions[0] + 1
         self.g_epos = a.positions[-1] + 1
         self.has_del = False
@@ -77,8 +81,6 @@ def set_SV(self):
                 pass
             
 
-
-
     def set_read_variant(self):
         gpos = self.g_spos
         self.g_spos_with_softclipped = self.g_spos
@@ -121,7 +123,7 @@ def set_read_variant(self):
             else:
                 for gp in range(prev_gpos, gpos):
                     base = self.readseq_with_softclipped[bidx]
-                    refbase = self.refseq[ridx].upper()
+                    refbase = self.refseq[gp].upper()
                     if base != refbase:
                         btype = 'S'
                         self.mismatch_list.append(gp)
diff --git a/src/bamsnap/drawreadset.py b/src/bamsnap/drawreadset.py
index 3d8274d..ec63f4a 100644
--- a/src/bamsnap/drawreadset.py
+++ b/src/bamsnap/drawreadset.py
@@ -266,15 +266,24 @@ def add_covmap(self, group, read):
             self.covmap[group][gpos] = (cov + 1, base_composition)
     
     def update_ref_seq_with_read(self, a):
-        read_ref_seq = a.get_reference_sequence()
         read_ref_pos = a.get_reference_positions()
+        try:
+            read_ref_seq = a.get_reference_sequence()
+        except ValueError: # when MD tag is missing.
+            read_ref_seq = {}
+
         for pidx in range(len(read_ref_pos)):
             gpos = read_ref_pos[pidx] + 1
-            base = read_ref_seq[pidx]
+
+            try:
+                base = read_ref_seq[pidx]
+            except KeyError: # when MD tag is missing
+                base = "N"
             try:
                 self.refseq[gpos]
             except KeyError:
                 self.refseq[gpos] = base.upper()
+        
 
     def calculate_readmap(self, is_strand_group=False):
         group_list = ['all']
@@ -289,8 +298,7 @@ def calculate_readmap(self, is_strand_group=False):
                 rid = self.get_rid(a)
                 self.update_ref_seq_with_read(a)
                 if not self.is_exist_read(rid):
-                    r = DrawRead(a)
-                    r.refseq = self.refseq
+                    r = DrawRead(a, self.refseq)
                     r.id = rid
                     r.read_gap_h = self.read_gap_h
                     r.read_gap_w = self.read_gap_w
diff --git a/tests/data/test_noMDtag_1_102345_103355.bam b/tests/data/test_noMDtag_1_102345_103355.bam
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index 0000000..2d3024b
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diff --git a/tests/data/test_noMDtag_1_102345_103355.bam.bai b/tests/data/test_noMDtag_1_102345_103355.bam.bai
new file mode 100644
index 0000000..7a3114f
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diff --git a/tests/out/NATRIO_chr10_117542948.png b/tests/out/NATRIO_chr10_117542948.png
index b193172..94ec635 100644
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index b8d0fbe..96e20b7 100644
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index d265e82..2f2c9ae 100644
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index 08415f5..ae79f74 100644
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diff --git a/tests/out/NATRIO_test_3/chr1:45803673.png b/tests/out/NATRIO_test_3/chr1:45803673.png
index 5b440a0..316a288 100644
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diff --git a/tests/out/NATRIO_test_3/chr5:197095.png b/tests/out/NATRIO_test_3/chr5:197095.png
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diff --git a/tests/out/test_DEL_1.png_bamsnap.log b/tests/out/test_DEL_1.png_bamsnap.log
deleted file mode 100644
index b44f448..0000000
--- a/tests/out/test_DEL_1.png_bamsnap.log
+++ /dev/null
@@ -1,195 +0,0 @@
-2020-09-02 15:33:07,128 : [INFO] (proc 1) Saved ./out/test_DEL_1.png : 0.64057 sec
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-2020-09-02 19:04:25,790 : [INFO] (proc 1) Saved ./out/test_DEL_1.png : 1.41181 sec
-2020-09-02 19:04:25,797 : [INFO] Total running time: 1.4 sec
-2020-09-02 19:04:47,166 : [INFO] (proc 1) Saved ./out/test_DEL_1.png : 2.08275 sec
-2020-09-02 19:04:47,173 : [INFO] Total running time: 2.1 sec
-2020-09-02 19:05:06,744 : [INFO] (proc 1) Saved ./out/test_DEL_1.png : 1.39239 sec
-2020-09-02 19:05:06,750 : [INFO] Total running time: 1.4 sec
-2020-09-02 19:05:33,785 : [INFO] (proc 1) Saved ./out/test_DEL_1.png : 1.3949 sec
-2020-09-02 19:05:33,791 : [INFO] Total running time: 1.4 sec
-2020-09-02 19:07:21,069 : [INFO] (proc 1) Saved ./out/test_DEL_1.png : 1.37197 sec
-2020-09-02 19:07:21,076 : [INFO] Total running time: 1.4 sec
-2020-09-02 19:10:42,281 : [INFO] (proc 1) Saved ./out/test_DEL_1.png : 1.40711 sec
-2020-09-02 19:10:42,303 : [INFO] Total running time: 1.4 sec
-2020-09-02 19:11:04,227 : [INFO] (proc 1) Saved ./out/test_DEL_1.png : 1.39195 sec
-2020-09-02 19:11:04,233 : [INFO] Total running time: 1.4 sec
-2020-09-02 20:50:19,065 : [INFO] (proc 1) Saved ./out/test_DEL_1.png : 1.40958 sec
-2020-09-02 20:50:19,085 : [INFO] Total running time: 1.4 sec
-2020-09-02 20:55:41,097 : [INFO] Total running time: 1.1 sec
-2020-09-02 20:56:31,991 : [INFO] (proc 1) Saved ./out/test_DEL_1.png : 1.41679 sec
-2020-09-02 20:56:31,997 : [INFO] Total running time: 1.4 sec
-2020-09-02 20:59:56,958 : [INFO] (proc 1) Saved ./out/test_DEL_1.png : 1.424 sec
-2020-09-02 20:59:56,964 : [INFO] Total running time: 1.4 sec
-2020-09-02 21:00:18,129 : [INFO] (proc 1) Saved ./out/test_DEL_1.png : 1.43767 sec
-2020-09-02 21:00:18,137 : [INFO] Total running time: 1.4 sec
-2020-09-02 21:22:41,335 : [INFO] (proc 1) Saved ./out/test_DEL_1.png : 1.40787 sec
-2020-09-02 21:22:41,341 : [INFO] Total running time: 1.4 sec
-2020-09-02 21:26:06,789 : [INFO] (proc 1) Saved ./out/test_DEL_1.png : 1.39197 sec
-2020-09-02 21:26:06,795 : [INFO] Total running time: 1.4 sec
-2020-09-03 18:05:41,933 : [INFO] (proc 1) Saved ./out/test_DEL_1.png : 1.94414 sec
-2020-09-03 18:05:41,948 : [INFO] Total running time: 2.0 sec
-2020-09-03 18:06:11,113 : [INFO] (proc 1) Saved ./out/test_DEL_1.png : 1.42392 sec
-2020-09-03 18:06:11,118 : [INFO] Total running time: 1.4 sec
-2020-09-03 18:10:11,868 : [INFO] Total running time: 0.4 sec
-2020-09-03 18:10:33,665 : [INFO] Total running time: 0.4 sec
-2020-09-03 18:11:34,875 : [INFO] Total running time: 0.4 sec
-2020-09-03 18:21:59,358 : [INFO] (proc 1) Saved ./out/test_DEL_1.png : 1.56681 sec
-2020-09-03 18:21:59,364 : [INFO] Total running time: 1.6 sec
-2020-09-03 18:32:25,666 : [INFO] (proc 1) Saved ./out/test_DEL_1.png : 1.44432 sec
-2020-09-03 18:32:25,671 : [INFO] Total running time: 1.5 sec
-2020-09-03 18:32:47,645 : [INFO] (proc 1) Saved ./out/test_DEL_1.png : 1.55731 sec
-2020-09-03 18:32:47,652 : [INFO] Total running time: 1.6 sec
-2020-09-03 19:41:34,246 : [INFO] (proc 1) Saved ./out/test_DEL_1.png : 1.40731 sec
-2020-09-03 19:41:34,252 : [INFO] Total running time: 1.4 sec
-2020-09-03 19:41:35,680 : [INFO] (proc 1) Saved ./out/test_DEL_1.png : 1.41945 sec
-2020-09-03 19:41:35,686 : [INFO] Total running time: 1.4 sec
-2020-09-03 19:41:37,117 : [INFO] (proc 1) Saved ./out/test_DEL_1.png : 1.42388 sec
-2020-09-03 19:41:37,122 : [INFO] Total running time: 1.4 sec
-2020-09-03 19:41:38,540 : [INFO] (proc 1) Saved ./out/test_DEL_1.png : 1.41136 sec
-2020-09-03 19:41:38,546 : [INFO] Total running time: 1.4 sec
-2020-09-03 19:41:39,943 : [INFO] (proc 1) Saved ./out/test_DEL_1.png : 1.38991 sec
-2020-09-03 19:41:39,949 : [INFO] Total running time: 1.4 sec
-2020-09-03 19:41:41,367 : [INFO] (proc 1) Saved ./out/test_DEL_1.png : 1.41021 sec
-2020-09-03 19:41:41,373 : [INFO] Total running time: 1.4 sec
-2020-09-03 19:41:42,796 : [INFO] (proc 1) Saved ./out/test_DEL_1.png : 1.41649 sec
-2020-09-03 19:41:42,802 : [INFO] Total running time: 1.4 sec
-2020-09-03 19:41:44,215 : [INFO] (proc 1) Saved ./out/test_DEL_1.png : 1.40685 sec
-2020-09-03 19:41:44,221 : [INFO] Total running time: 1.4 sec
-2020-09-03 19:41:45,769 : [INFO] (proc 1) Saved ./out/test_DEL_1.png : 1.54118 sec
-2020-09-03 19:41:45,775 : [INFO] Total running time: 1.5 sec
-2020-09-03 19:41:47,223 : [INFO] (proc 1) Saved ./out/test_DEL_1.png : 1.43974 sec
-2020-09-03 19:41:47,228 : [INFO] Total running time: 1.4 sec
-2020-09-03 19:41:48,664 : [INFO] (proc 1) Saved ./out/test_DEL_1.png : 1.4291 sec
-2020-09-03 19:41:48,670 : [INFO] Total running time: 1.4 sec
-2020-09-03 19:41:50,422 : [INFO] (proc 1) Saved ./out/test_DEL_1.png : 1.74539 sec
-2020-09-03 19:41:50,429 : [INFO] Total running time: 1.8 sec
-2020-09-03 19:41:51,868 : [INFO] (proc 1) Saved ./out/test_DEL_1.png : 1.43202 sec
-2020-09-03 19:41:51,875 : [INFO] Total running time: 1.4 sec
-2020-09-03 19:41:53,326 : [INFO] (proc 1) Saved ./out/test_DEL_1.png : 1.44273 sec
-2020-09-03 19:41:53,333 : [INFO] Total running time: 1.5 sec
-2020-09-03 19:41:54,764 : [INFO] (proc 1) Saved ./out/test_DEL_1.png : 1.42403 sec
-2020-09-03 19:41:54,771 : [INFO] Total running time: 1.4 sec
-2020-09-03 19:41:56,199 : [INFO] (proc 1) Saved ./out/test_DEL_1.png : 1.42131 sec
-2020-09-03 19:41:56,206 : [INFO] Total running time: 1.4 sec
-2020-09-03 19:41:57,688 : [INFO] (proc 1) Saved ./out/test_DEL_1.png : 1.4759 sec
-2020-09-03 19:41:57,696 : [INFO] Total running time: 1.5 sec
-2020-09-03 19:41:59,162 : [INFO] (proc 1) Saved ./out/test_DEL_1.png : 1.45842 sec
-2020-09-03 19:41:59,169 : [INFO] Total running time: 1.5 sec
-2020-09-03 19:42:00,637 : [INFO] (proc 1) Saved ./out/test_DEL_1.png : 1.44932 sec
-2020-09-03 19:42:00,644 : [INFO] Total running time: 1.5 sec
-2020-09-03 19:42:02,061 : [INFO] (proc 1) Saved ./out/test_DEL_1.png : 1.41005 sec
-2020-09-03 19:42:02,067 : [INFO] Total running time: 1.4 sec
-2020-09-03 19:42:03,510 : [INFO] (proc 1) Saved ./out/test_DEL_1.png : 1.4357 sec
-2020-09-03 19:42:03,516 : [INFO] Total running time: 1.4 sec
-2020-09-03 19:42:04,951 : [INFO] (proc 1) Saved ./out/test_DEL_1.png : 1.42885 sec
-2020-09-03 19:42:04,958 : [INFO] Total running time: 1.4 sec
diff --git a/tests/out/test_INV_1.png b/tests/out/test_INV_1.png
index d97f4a0..3be66a6 100644
Binary files a/tests/out/test_INV_1.png and b/tests/out/test_INV_1.png differ
diff --git a/tests/out/test_INV_1.png_bamsnap.log b/tests/out/test_INV_1.png_bamsnap.log
deleted file mode 100644
index c8c6312..0000000
--- a/tests/out/test_INV_1.png_bamsnap.log
+++ /dev/null
@@ -1,12 +0,0 @@
-2020-09-02 19:55:32,967 : [INFO] (proc 1) Saved ./out/test_INV_1.png : 0.46255 sec
-2020-09-02 19:55:32,970 : [INFO] Total running time: 0.5 sec
-2020-09-02 19:56:01,290 : [INFO] (proc 1) Saved ./out/test_INV_1.png : 0.36901 sec
-2020-09-02 19:56:01,293 : [INFO] Total running time: 0.4 sec
-2020-09-02 19:56:36,338 : [INFO] (proc 1) Saved ./out/test_INV_1.png : 0.37147 sec
-2020-09-02 19:56:36,356 : [INFO] Total running time: 0.4 sec
-2020-09-02 19:56:47,529 : [INFO] (proc 1) Saved ./out/test_INV_1.png : 0.38209 sec
-2020-09-02 19:56:47,541 : [INFO] Total running time: 0.4 sec
-2020-09-02 20:26:47,231 : [INFO] (proc 1) Saved ./out/test_INV_1.png : 0.36446 sec
-2020-09-02 20:26:47,245 : [INFO] Total running time: 0.4 sec
-2020-09-02 20:47:30,430 : [INFO] (proc 1) Saved ./out/test_INV_1.png : 0.39056 sec
-2020-09-02 20:47:30,434 : [INFO] Total running time: 0.4 sec
diff --git a/tests/out/test_SV1-3.png b/tests/out/test_SV1-3.png
index af3a0fe..3dc923d 100644
Binary files a/tests/out/test_SV1-3.png and b/tests/out/test_SV1-3.png differ
diff --git a/tests/out/test_SV1-3_1.png b/tests/out/test_SV1-3_1.png
index 6ff5e53..c640ec0 100644
Binary files a/tests/out/test_SV1-3_1.png and b/tests/out/test_SV1-3_1.png differ
diff --git a/tests/out/test_SV1-4.png b/tests/out/test_SV1-4.png
index 97b17cb..c3538ae 100644
Binary files a/tests/out/test_SV1-4.png and b/tests/out/test_SV1-4.png differ
diff --git a/tests/out/test_SV1-5.png b/tests/out/test_SV1-5.png
index ce62ccc..b29d93c 100644
Binary files a/tests/out/test_SV1-5.png and b/tests/out/test_SV1-5.png differ
diff --git a/tests/out/test_SV1-6.png b/tests/out/test_SV1-6.png
index 96a9cbf..484219b 100644
Binary files a/tests/out/test_SV1-6.png and b/tests/out/test_SV1-6.png differ
diff --git a/tests/out/test_noMDtag_1.png b/tests/out/test_noMDtag_1.png
new file mode 100644
index 0000000..a67655d
Binary files /dev/null and b/tests/out/test_noMDtag_1.png differ
diff --git a/tests/out/test_noMDtag_1_IGV.png b/tests/out/test_noMDtag_1_IGV.png
new file mode 100644
index 0000000..628a7e1
Binary files /dev/null and b/tests/out/test_noMDtag_1_IGV.png differ
diff --git a/tests/test_run.py b/tests/test_run.py
index 035450c..29a6852 100644
--- a/tests/test_run.py
+++ b/tests/test_run.py
@@ -256,16 +256,27 @@
 """)  # coordinates track example 3
 
 
+cmdlist.append("""
+    -bam ./data/test_noMDtag_1_102345_103355.bam \
+    -pos 1:102545 \
+    -margin 1000 \
+    -title noMDtag \
+    -out ./out/test_noMDtag_1.png \
+    -refversion hg19 \
+    -show_soft_clipped \
+    -save_image_only
+""")  # coordinates track example 3
+
 def test_run():
     for cmd in cmdlist:
-        cmd = cmdlist[-1]
+        # cmd = cmdlist[-1]
         cmd = bamsnap_prog + " " + cmd.strip()
         sys.argv = shlex.split(cmd)
         print(' '.join(sys.argv))
         # print(cmd)
         # print(shlex.quote(sys.argv))
         bamsnap.cli()
-        # break
+        
 
 
 if __name__ == "__main__":