diff --git a/source/dnode/vnode/src/tsdb/tsdbCache.c b/source/dnode/vnode/src/tsdb/tsdbCache.c
index 78f53a3adb..482b194a1f 100644
--- a/source/dnode/vnode/src/tsdb/tsdbCache.c
+++ b/source/dnode/vnode/src/tsdb/tsdbCache.c
@@ -936,8 +936,8 @@ int32_t tsdbCacheDropSubTables(STsdb *pTsdb, SArray *uids, tb_uid_t suid) {
       if (code != TSDB_CODE_SUCCESS) {
         tsdbError("vgId:%d, %s drop table column failed at line %d since %s", TD_VID(pTsdb->pVnode), __func__, __LINE__,
                   tstrerror(code));
-        taosMemoryFree(pTSchema);
         (void)taosThreadMutexUnlock(&pTsdb->lruMutex);
+        taosMemoryFree(pTSchema);
         TAOS_RETURN(code);
       }
     }