diff --git a/pympipool/shared/taskexecutor.py b/pympipool/shared/taskexecutor.py
index 78592a27..8ee7367d 100644
--- a/pympipool/shared/taskexecutor.py
+++ b/pympipool/shared/taskexecutor.py
@@ -42,6 +42,8 @@ def cloudpickle_register(ind=2):
     """
     try:  # When executed in a jupyter notebook this can cause a ValueError - in this case we just ignore it.
         cloudpickle.register_pickle_by_value(inspect.getmodule(inspect.stack()[ind][0]))
+    except IndexError:
+        cloudpickle_register(ind=ind - 1)
     except ValueError:
         pass