diff --git a/src/tsdb/src/tsdbBuffer.c b/src/tsdb/src/tsdbBuffer.c
index 013bae69a0..f27af3b722 100644
--- a/src/tsdb/src/tsdbBuffer.c
+++ b/src/tsdb/src/tsdbBuffer.c
@@ -114,7 +114,7 @@ void tsdbCloseBufPool(STsdbRepo *pRepo) {
 
 SListNode *tsdbAllocBufBlockFromPool(STsdbRepo *pRepo) {
   ASSERT(pRepo != NULL && pRepo->pool != NULL);
-  // ASSERT pRepo is locked
+  ASSERT(IS_REPO_LOCKED(pRepo));
 
   STsdbCfg *    pCfg = &pRepo->config;
   STsdbBufPool *pBufPool = pRepo->pool;
diff --git a/src/tsdb/src/tsdbMemTable.c b/src/tsdb/src/tsdbMemTable.c
index c848b7644b..55fda4e116 100644
--- a/src/tsdb/src/tsdbMemTable.c
+++ b/src/tsdb/src/tsdbMemTable.c
@@ -170,6 +170,17 @@ static void *tsdbAllocBytes(STsdbRepo *pRepo, int bytes) {
 
         tsdbUnRefMemTable(pRepo, pIMem);
       }
+    } else {
+      if (tsdbLockRepo(pRepo) < 0) {
+        tsdbFreeMemTable(pMemTable);
+        return NULL;
+      }
+
+      SListNode *pNode = tsdbAllocBufBlockFromPool(pRepo);
+      tdListAppendNode(pMemTable->bufBlockList, pNode);
+      pRepo->mem = pMemTable;
+
+      if (tsdbUnlockRepo(pRepo) < 0) return NULL;
     }
   }