diff --git a/src/gui_qt/fit/fitfunction.py b/src/gui_qt/fit/fitfunction.py
index 204fcf3..878f166 100644
--- a/src/gui_qt/fit/fitfunction.py
+++ b/src/gui_qt/fit/fitfunction.py
@@ -52,12 +52,15 @@ class QFunctionWidget(QtWidgets.QWidget, Ui_Form):
         try:
             user_defined = find_models(config_paths() / 'usermodels.py')
         except Exception as e:
-            import traceback
+            import traceback, sys
+
+            exc_type, exc_value, exc_traceback = sys.exc_info()
+
             _ = QtWidgets.QMessageBox.warning(
                 self,
                 'No user functions',
                 f'Loading user-defined function failed with exception:\n'
-                f'{"".join(traceback.format_exception(e, limit=1))}')
+                f'{"".join(traceback.format_exception(exc_type, exc_value, exc_traceback, limit=1))}')
             logger.exception("Invalid usermodels.py", exc_info=e)
 
         for model in user_defined: