diff --git a/im-center-server/src/main/java/cn/axzo/im/dao/repository/GroupDao.java b/im-center-server/src/main/java/cn/axzo/im/dao/repository/GroupDao.java
index a795556..81044c6 100644
--- a/im-center-server/src/main/java/cn/axzo/im/dao/repository/GroupDao.java
+++ b/im-center-server/src/main/java/cn/axzo/im/dao/repository/GroupDao.java
@@ -50,6 +50,7 @@ public class GroupDao extends ServiceImpl<GroupMapper, Group> {
         return lambdaQuery()
                 .eq(Group::getBizCode, bizCode)
                 .eq(Group::getType, groupType)
+                .ne(Group::getIsDismissed, YesOrNo.NO)
                 .last(forUpdate, "FOR UPDATE")
                 .oneOpt();
     }
diff --git a/im-center-server/src/main/java/cn/axzo/im/group/GroupManager.java b/im-center-server/src/main/java/cn/axzo/im/group/GroupManager.java
index 740ad92..0b48def 100644
--- a/im-center-server/src/main/java/cn/axzo/im/group/GroupManager.java
+++ b/im-center-server/src/main/java/cn/axzo/im/group/GroupManager.java
@@ -66,10 +66,10 @@ public class GroupManager {
         // DON'T delete this line
         accountService.maybeCreateImAccounts(request.getPeople());
         return transactionTemplate.execute(unused -> {
-            Group savedGroup = groupDao.findByBizCode(request.getBizCode(), request.getGroupType(), true)
+            Group savedGroup = groupDao
+                    .findByBizCode(request.getBizCode(), request.getGroupType(), true)
                     .orElse(null);
-            BizAssertions.assertTrue(savedGroup == null || savedGroup.isDismissed(),
-                    String.format("群已经存在: %s", request.getName()));
+            BizAssertions.assertTrue(savedGroup == null, String.format("群已经存在: %s", request.getName()));
             ImAccounts imAccounts = accountService.getAccountsByPersons(request.getPeople());
             String owner = imAccounts.findAccount(request.getOwner()).orElse(null);
             BizAssertions.assertNotNull(owner, "群主没有IM账号, 无法创建群. {}", request.getOwner());