diff --git a/frontend/src/components/context-vars/ContextVarForm.tsx b/frontend/src/components/context-vars/ContextVarForm.tsx
index ba8d9ae2..6250daea 100644
--- a/frontend/src/components/context-vars/ContextVarForm.tsx
+++ b/frontend/src/components/context-vars/ContextVarForm.tsx
@@ -32,7 +32,7 @@ export const ContextVarForm: FC<ComponentFormProps<IContextVar>> = ({
   const options = {
     onError: (error: Error) => {
       rest.onError?.();
-      toast.error(error || t("message.internal_server_error"));
+      toast.error(error.message || t("message.internal_server_error"));
     },
     onSuccess: () => {
       rest.onSuccess?.();