diff --git a/source/dnode/vnode/src/tsdb/tsdbReadUtil.c b/source/dnode/vnode/src/tsdb/tsdbReadUtil.c
index 3051b097be..d7da6cbd9d 100644
--- a/source/dnode/vnode/src/tsdb/tsdbReadUtil.c
+++ b/source/dnode/vnode/src/tsdb/tsdbReadUtil.c
@@ -656,7 +656,7 @@ int32_t initBlockIterator(STsdbReader* pReader, SDataBlockIter* pBlockIter, int3
     }
 
     void* p = taosArrayAddAll(pBlockIter->blockList, pTableScanInfo->pBlockList);
-    if (p != NULL) {
+    if (p == NULL) {
       return TSDB_CODE_OUT_OF_MEMORY;
     }