diff --git a/packages/plugins/@nocobase/plugin-workflow/src/client/nodes/index.tsx b/packages/plugins/@nocobase/plugin-workflow/src/client/nodes/index.tsx
index 973495c086..38f664c1ff 100644
--- a/packages/plugins/@nocobase/plugin-workflow/src/client/nodes/index.tsx
+++ b/packages/plugins/@nocobase/plugin-workflow/src/client/nodes/index.tsx
@@ -385,7 +385,7 @@ function TestFormFieldset({ value, onChange }) {
           value={get(value, key)}
           onChange={(v) => {
             set(value, key, v);
-            onChange(value);
+            onChange(toJS(value));
           }}
         />
       ))}