diff --git a/source/dnode/vnode/src/tsdb/tsdbMergeTree.c b/source/dnode/vnode/src/tsdb/tsdbMergeTree.c
index 3af0d40382..d84d9c2999 100644
--- a/source/dnode/vnode/src/tsdb/tsdbMergeTree.c
+++ b/source/dnode/vnode/src/tsdb/tsdbMergeTree.c
@@ -502,8 +502,10 @@ static void setSttInfoForCurrentTable(SSttBlockLoadInfo *pLoadInfo, uint64_t uid
 
     *numOfRows += *(int64_t *)taosArrayGet(pLoadInfo->info.pCount, index);
 
-    memcpy(&pRange->skey.pks[0], taosArrayGet(pLoadInfo->info.pFirstKey, index), sizeof(SValue));
-    memcpy(&pRange->ekey.pks[0], taosArrayGet(pLoadInfo->info.pLastKey, index), sizeof(SValue));
+    if (pRange->skey.numOfPKs > 0) {
+      memcpy(&pRange->skey.pks[0], taosArrayGet(pLoadInfo->info.pFirstKey, index), sizeof(SValue));
+      memcpy(&pRange->ekey.pks[0], taosArrayGet(pLoadInfo->info.pLastKey, index), sizeof(SValue));
+    }
   }
 }