diff --git a/custom_components/monitor_docker/__init__.py b/custom_components/monitor_docker/__init__.py
index 22f20ec..ae1aef0 100644
--- a/custom_components/monitor_docker/__init__.py
+++ b/custom_components/monitor_docker/__init__.py
@@ -115,7 +115,7 @@ def RunDocker(hass, entry):
                 if entry[CONF_RETRY] == 0:
                     raise
                 else:
-                    _LOGGER.error("%s", err)
+                    _LOGGER.error("%s", str(err))
                     _LOGGER.error("Retry in %d seconds", entry[CONF_RETRY])
                     time.sleep(entry[CONF_RETRY])
 
diff --git a/custom_components/monitor_docker/helpers.py b/custom_components/monitor_docker/helpers.py
index 5eee59c..3ca0fa3 100644
--- a/custom_components/monitor_docker/helpers.py
+++ b/custom_components/monitor_docker/helpers.py
@@ -115,7 +115,7 @@ def __init__(self, hass, config, startCount=0):
                 url = url.replace("unix://", "unix:///")
 
             # When we reconnect with tcp, we should delay - docker is maybe not fully ready
-            if startCount > 0 and url.find("unix:") != 0:
+            if startCount > 0 and url is not None and url.find("unix:") != 0:
                 time.sleep(5)
 
             # Do some debugging logging for TCP/TLS
@@ -938,7 +938,8 @@ async def _run_container_stats(self):
                     cache = raw["memory_stats"]["stats"]["inactive_file"]
 
             memory_stats["usage"] = toMB(
-                raw["memory_stats"]["usage"] - cache, self._config[CONF_PRECISION_MEMORY_MB]
+                raw["memory_stats"]["usage"] - cache,
+                self._config[CONF_PRECISION_MEMORY_MB],
             )
             memory_stats["limit"] = toMB(
                 raw["memory_stats"]["limit"], self._config[CONF_PRECISION_MEMORY_MB]