diff --git a/source/libs/executor/src/timewindowoperator.c b/source/libs/executor/src/timewindowoperator.c
index 9198862ba34819fb7ccdcc6d73704dd4ddc33858..610303dc50218255e84a68e1b4b3b1ab170dc6bf 100644
--- a/source/libs/executor/src/timewindowoperator.c
+++ b/source/libs/executor/src/timewindowoperator.c
@@ -1695,7 +1695,7 @@ void destroyStreamFinalIntervalOperatorInfo(void* param, int32_t numOfOutput) {
 
 static bool allInvertible(SqlFunctionCtx* pFCtx, int32_t numOfCols) {
   for (int32_t i = 0; i < numOfCols; i++) {
-    if (!fmIsInvertible(pFCtx[i].functionId)) {
+    if (fmIsUserDefinedFunc(pFCtx[i].functionId) || !fmIsInvertible(pFCtx[i].functionId)) {
       return false;
     }
   }