diff --git a/AVOS/AVOSCloudIM/Conversation/AVIMConversation.m b/AVOS/AVOSCloudIM/Conversation/AVIMConversation.m
index be958ae7..835b63e1 100644
--- a/AVOS/AVOSCloudIM/Conversation/AVIMConversation.m
+++ b/AVOS/AVOSCloudIM/Conversation/AVIMConversation.m
@@ -652,7 +652,9 @@ - (id)objectForKeyedSubscript:(NSString *)key
 - (void)fetchReceiptTimestampsInBackground
 {
     AVIMClient *client = self.imClient;
-    if (!client) {
+    if (!client ||
+        (self.convType == LCIMConvTypeTransient) ||
+        (self.convType == LCIMConvTypeSystem)) {
         return;
     }
     
@@ -1204,7 +1206,8 @@ - (void)unmuteWithCallback:(void (^)(BOOL, NSError *))callback
 - (void)readInBackground
 {
     AVIMClient *client = self.imClient;
-    if (!client) {
+    if (!client ||
+        (self.convType == LCIMConvTypeTransient)) {
         return;
     }