diff --git a/source/dnode/vnode/src/tsdb/tsdbMergeTree.c b/source/dnode/vnode/src/tsdb/tsdbMergeTree.c
index 6c67c11220a60185cdef78192ee4e36b2adfc194..745b877f09aa3103157cbd329af296e65e79e2d5 100644
--- a/source/dnode/vnode/src/tsdb/tsdbMergeTree.c
+++ b/source/dnode/vnode/src/tsdb/tsdbMergeTree.c
@@ -290,7 +290,7 @@ int32_t tLDataIterOpen(struct SLDataIter **pIter, SDataFReader *pReader, int32_t
     // only apply to the child tables, ordinary tables will not incur this filter procedure.
     size = taosArrayGetSize(pBlockLoadInfo->aSttBlk);
 
-    if (size > 1) {
+    if (size >= 1) {
       SSttBlk *pStart = taosArrayGet(pBlockLoadInfo->aSttBlk, 0);
       SSttBlk *pEnd = taosArrayGet(pBlockLoadInfo->aSttBlk, size - 1);