diff --git a/slixmpp_omemo/__init__.py b/slixmpp_omemo/__init__.py
index 9a373ab..be9a181 100644
--- a/slixmpp_omemo/__init__.py
+++ b/slixmpp_omemo/__init__.py
@@ -410,8 +410,8 @@ class XEP_0384(BasePlugin):
                     expect_problems=expect_problems,
                 )
                 return _generate_encrypted_payload(encrypted)
-            except omemo.exceptions.EncryptionProblemsException as e:
-                errors = e.problems
+            except omemo.exceptions.EncryptionProblemsException as exn:
+                errors = exn.problems
 
             if errors == old_errors:
                 raise EncryptionPrepareException(errors)