diff --git a/instana/meter.py b/instana/meter.py
index ffe6cfc0d..249f4a34e 100644
--- a/instana/meter.py
+++ b/instana/meter.py
@@ -205,7 +205,7 @@ def collect_modules(self):
 
             return r
         except Exception as e:
-            l.error("collect_modules: ", e)
+            l.error("collect_modules: ", str(e))
 
             return None