diff --git a/source/util/src/tpagedbuf.c b/source/util/src/tpagedbuf.c
index 76cf067842..b5a79b6fd7 100644
--- a/source/util/src/tpagedbuf.c
+++ b/source/util/src/tpagedbuf.c
@@ -401,6 +401,7 @@ int32_t createDiskbasedBuf(SDiskbasedBuf** pBuf, int32_t pagesize, int32_t inMem
   return TSDB_CODE_SUCCESS;
 _error:
   destroyDiskbasedBuf(pPBuf);
+  *pBuf = NULL;
   return TSDB_CODE_OUT_OF_MEMORY;
 }