diff --git a/src/blockchain_processor.py b/src/blockchain_processor.py
index 176a5407..ff72b63a 100644
--- a/src/blockchain_processor.py
+++ b/src/blockchain_processor.py
@@ -119,7 +119,8 @@ def set_time(self):
         self.time_ref = time.time()
 
     def print_time(self, num_tx):
-        delta = time.time() - self.time_ref
+        # add something at end so ZeroDivision never happens
+        delta = time.time() - self.time_ref + 0000000000.000001
         # leaky averages
         seconds_per_block, tx_per_second, n = self.avg_time
         alpha = (1. + 0.01 * n)/(n+1)