diff --git a/source/dnode/vnode/src/tq/tq.c b/source/dnode/vnode/src/tq/tq.c
index 32ce47d5e0..37c0b8e0a3 100644
--- a/source/dnode/vnode/src/tq/tq.c
+++ b/source/dnode/vnode/src/tq/tq.c
@@ -1640,6 +1640,7 @@ int32_t tqProcessStreamCheckPointSourceReq(STQ* pTq, SRpcMsg* pMsg) {
     SRpcMsg rsp = {0};
     buildCheckpointSourceRsp(&req, &pMsg->info, &rsp, 0);
     tmsgSendRsp(&rsp);   // error occurs
+    taosThreadMutexUnlock(&pTask->lock);
     return TSDB_CODE_SUCCESS;
   }
   streamProcessCheckpointSourceReq(pTask, &req);