diff --git a/internal/proxy/impl.go b/internal/proxy/impl.go
index 3e68fc18ff..c5e1830c59 100644
--- a/internal/proxy/impl.go
+++ b/internal/proxy/impl.go
@@ -1563,8 +1563,6 @@ func (node *Proxy) Query(ctx context.Context, request *milvuspb.QueryRequest) (*
 		}, nil
 	}
 
-	errMsg := "Invalid expression!"
-	err = errors.New(errMsg)
 	return &milvuspb.QueryResults{
 		Status: &commonpb.Status{
 			ErrorCode: commonpb.ErrorCode_UnexpectedError,