diff --git a/server/api/ProcDecorator/base.ts b/server/api/ProcDecorator/base.ts
index 658cd63..7fba3d5 100644
--- a/server/api/ProcDecorator/base.ts
+++ b/server/api/ProcDecorator/base.ts
@@ -80,7 +80,7 @@ export function declProcDecorators<T extends ProcDecoratorChain>(...decorators:
         async (ctx, req, res) => {
             let rctx = ctx as unknown as OutType;
             const decoratorStack: DecoratorStack = [];
-            if (!preDecorator) {
+            if (!preDecorator.length) {
                 return [decoratorStack, rctx];
             }