diff --git a/api/core/app/segments/exc.py b/api/core/app/segments/exc.py
index d15d6d500..5cf67c3ba 100644
--- a/api/core/app/segments/exc.py
+++ b/api/core/app/segments/exc.py
@@ -1,2 +1,2 @@
-class VariableError(Exception):
+class VariableError(ValueError):
     pass