diff --git a/src/query/src/qExecutor.c b/src/query/src/qExecutor.c
index 858673212cb2a8f039bfd07636449ae147e73ae4..20987720cb1c88c9c7f2f8320b18e3843bffa7ec 100644
--- a/src/query/src/qExecutor.c
+++ b/src/query/src/qExecutor.c
@@ -1041,6 +1041,8 @@ static void doApplyFunctions(SQueryRuntimeEnv* pRuntimeEnv, SQLFunctionCtx* pCtx
 
     if (tsCol != NULL) {
       pCtx[k].ptsList = &tsCol[pos];
+    } else {
+      pCtx[k].ptsList = NULL;
     }
 
     // not a whole block involved in query processing, statistics data can not be used