diff --git a/flask_security/datastore.py b/flask_security/datastore.py
index c66a63e..44193a0 100644
--- a/flask_security/datastore.py
+++ b/flask_security/datastore.py
@@ -195,7 +195,7 @@ class SQLAlchemyUserDatastore(SQLAlchemyDatastore, UserDatastore):
     def _is_numeric(self, value):
         try:
             int(value)
-        except ValueError:
+        except (TypeError, ValueError):
             return False
         return True