diff --git a/source/libs/index/src/indexFst.c b/source/libs/index/src/indexFst.c
index a146564c9efcb27e60b50dce679ae812810b52bb..bc3ecea7a5d4bc4f369ea53cf6ab168b878496ae 100644
--- a/source/libs/index/src/indexFst.c
+++ b/source/libs/index/src/indexFst.c
@@ -642,6 +642,9 @@ static const char* fstNodeState(FstNode* node) {
 }
 
 void fstNodeDestroy(FstNode* node) {
+  if (node == NULL) {
+    return;
+  }
   fstSliceDestroy(&node->data);
   taosMemoryFree(node);
 }
@@ -1247,7 +1250,10 @@ bool streamWithStateSeekMin(StreamWithState* sws, FstBoundWithData* min) {
       // autState = sws->aut->accept(preState, b);
       autState = automFuncs[aut->type].accept(aut, preState, b);
       taosArrayPush(sws->inp, &b);
+
       StreamState s = {.node = node, .trans = res + 1, .out = {.null = false, .out = out}, .autState = preState};
+      node = NULL;
+
       taosArrayPush(sws->stack, &s);
       out += trn.out;
       node = fstGetNode(sws->fst, trn.addr);
@@ -1271,6 +1277,9 @@ bool streamWithStateSeekMin(StreamWithState* sws, FstBoundWithData* min) {
       return true;
     }
   }
+
+  fstNodeDestroy(node);
+
   uint32_t sz = taosArrayGetSize(sws->stack);
   if (sz != 0) {
     StreamState* s = taosArrayGet(sws->stack, sz - 1);
diff --git a/source/libs/index/test/fstTest.cc b/source/libs/index/test/fstTest.cc
index c45f655746a2a9568bf928a3fcedabb1f005e837..bfe1bb21bffd43841c507d20af0a12b3b7e473a6 100644
--- a/source/libs/index/test/fstTest.cc
+++ b/source/libs/index/test/fstTest.cc
@@ -480,6 +480,15 @@ void checkFstCheckIteratorRange2() {
     assert(result.size() == 4);
     automCtxDestroy(ctx);
   }
+  {
+    // range  search
+    std::vector<uint64_t> result;
+    AutomationCtx*        ctx = automCtxCreate((void*)"he", AUTOMATION_ALWAYS);
+    // [b, e)
+    m->SearchRange(ctx, "bb", GE, "ed", LT, result);
+    assert(result.size() == 3);
+    automCtxDestroy(ctx);
+  }
   {
     // range  search
     std::vector<uint64_t> result;
@@ -635,11 +644,11 @@ int main(int argc, char* argv[]) {
   // path suid colName ver
   // iterTFileReader(argv[1], argv[2], argv[3], argv[4]);
   //}
-  // checkFstCheckIterator1();
-  // checkFstCheckIterator2();
-  // checkFstCheckIteratorPrefix();
-  // checkFstCheckIteratorRange1();
-  // checkFstCheckIteratorRange2();
+  checkFstCheckIterator1();
+  checkFstCheckIterator2();
+  checkFstCheckIteratorPrefix();
+  checkFstCheckIteratorRange1();
+  checkFstCheckIteratorRange2();
   checkFstCheckIteratorRange3();
   // checkFstLongTerm();
   // checkFstPrefixSearch();