diff --git a/src/tsdb/src/tsdbRead.c b/src/tsdb/src/tsdbRead.c
index 87adf46d09e5d66dff47a16bdffcc273b4417cbf..45f6541d9f8087988575b03ad5dcdf64e161b31e 100644
--- a/src/tsdb/src/tsdbRead.c
+++ b/src/tsdb/src/tsdbRead.c
@@ -986,7 +986,9 @@ static SMemRow getSMemRowInTableMem(STableCheckInfo* pCheckInfo, int32_t order,
       return rmem;
     } else {
       pCheckInfo->chosen = CHECKINFO_CHOSEN_BOTH;
-      *extraRow = rimem;
+      if (extraRow) {
+        *extraRow = rimem;
+      }
       return rmem;
     }
   } else {