diff --git a/api/core/workflow/nodes/variable_assigner/common/exc.py b/api/core/workflow/nodes/variable_assigner/common/exc.py
index a1178fb020..f8dbedc290 100644
--- a/api/core/workflow/nodes/variable_assigner/common/exc.py
+++ b/api/core/workflow/nodes/variable_assigner/common/exc.py
@@ -1,4 +1,4 @@
-class VariableOperatorNodeError(Exception):
+class VariableOperatorNodeError(ValueError):
     """Base error type, don't use directly."""
 
     pass