diff --git a/util/lib.py b/util/lib.py
index b880d25..916abb4 100644
--- a/util/lib.py
+++ b/util/lib.py
@@ -405,7 +405,7 @@ def robot_prepare_ontology(
     try:
         check_call(callstring)
     except subprocess.CalledProcessError as e:
-        logging.exception("Preparing %s for dashboard failed: %s", o_path, str(e))
+        logging.exception("Preparing %s for dashboard failed", o_path)
 
 def count_up(dictionary, value):
     if value not in dictionary: