diff --git a/fuma/ComparisonTriangle.py b/fuma/ComparisonTriangle.py
index c491234..bafb173 100644
--- a/fuma/ComparisonTriangle.py
+++ b/fuma/ComparisonTriangle.py
@@ -147,7 +147,10 @@ def prune_duplicates(self,merged_fusions):
 	
 	def log_progress(self,n_total, passed, previous_percentage):
 		# Print percentage - doesn't entirely fit yet
-		percentage = 100.0 * (float(passed) / float(n_total))
+		try:
+			percentage = 100.0 * (float(passed) / float(n_total))
+		except ZeroDivisionError:
+			percentage = 100.0
 		if percentage >= previous_percentage + 5.0 or passed == n_total:# Repport each 5%
 			self.logger.debug(str(round(percentage,1))+"% completed")
 			previous_percentage = percentage