fix(trace): ignored key checking

Author: maorlx

epsagon/trace.py

@@ -1048,7 +1048,9 @@ def _strip_key(key):
         :param key: The key to strip.
         :return: Stripped key.
         """
-        return key.lower().replace('-', '').replace('_', '').replace(' ', '')
+        return (
+            str(key).lower().replace('-', '').replace('_', '').replace(' ', '')
+        )
 
     def remove_ignored_keys(self, input_dict):
         """