diff --git a/source/libs/function/src/builtins.c b/source/libs/function/src/builtins.c
index b5904b6b81..cf8c8399c4 100644
--- a/source/libs/function/src/builtins.c
+++ b/source/libs/function/src/builtins.c
@@ -1737,7 +1737,7 @@ const SBuiltinFuncDefinition funcMgtBuiltins[] = {
     .combineFunc  = topCombine,
     .pPartialFunc = "_top_partial",
     .pMergeFunc   = "_top_merge",
-    .createMergeParaFuc = topCreateMergePara
+    // .createMergeParaFuc = topCreateMergePara
   },
   {
     .name = "_top_partial",
diff --git a/source/libs/function/src/functionMgt.c b/source/libs/function/src/functionMgt.c
index afbb63114d..245636bac8 100644
--- a/source/libs/function/src/functionMgt.c
+++ b/source/libs/function/src/functionMgt.c
@@ -321,16 +321,18 @@ static int32_t createMergeFunction(const SFunctionNode* pSrcFunc, const SFunctio
   if (TSDB_CODE_SUCCESS == code) {
     // overwrite function restype set by translate function
     if (fmIsSameInOutType(pSrcFunc->funcId)) {
-      (*pMergeFunc)->node.resType = pSrcFunc->node.resType;
+      pFunc->node.resType = pSrcFunc->node.resType;
     }
-    strcpy((*pMergeFunc)->node.aliasName, pSrcFunc->node.aliasName);
+    strcpy(pFunc->node.aliasName, pSrcFunc->node.aliasName);
   }
 
   if (TSDB_CODE_SUCCESS == code) {
     *pMergeFunc = pFunc;
   } else {
-    pFunc->pParameterList = NULL;
-    nodesDestroyNode((SNode*)pFunc);
+    if (NULL != pFunc) {
+      pFunc->pParameterList = NULL;
+      nodesDestroyNode((SNode*)pFunc);
+    }
     nodesDestroyList(pParameterList);
   }
 
diff --git a/source/libs/planner/test/planBasicTest.cpp b/source/libs/planner/test/planBasicTest.cpp
index c075bfeee8..4213cc050c 100644
--- a/source/libs/planner/test/planBasicTest.cpp
+++ b/source/libs/planner/test/planBasicTest.cpp
@@ -52,6 +52,8 @@ TEST_F(PlanBasicTest, func) {
   run("SELECT PERCENTILE(c1, 60) FROM t1");
 
   run("SELECT TOP(c1, 60) FROM t1");
+
+  run("SELECT TOP(c1, 60) FROM st1");
 }
 
 TEST_F(PlanBasicTest, uniqueFunc) {