diff --git a/lib/MySQL_HostGroups_Manager.cpp b/lib/MySQL_HostGroups_Manager.cpp
index 339a1dfa0..cbc417f9f 100644
--- a/lib/MySQL_HostGroups_Manager.cpp
+++ b/lib/MySQL_HostGroups_Manager.cpp
@@ -4573,7 +4573,8 @@ void MySQL_HostGroups_Manager::read_only_action_v2(const std::list<std::tuple<st
 		auto itr = hostgroup_server_mapping.find(srv_id);
 
 		if (itr == hostgroup_server_mapping.end()) {
-			assert(0);
+			proxy_warning("Server %s:%d not found\n", hostname.c_str(), port);
+			continue;
 		}
 
 		HostGroup_Server_Mapping& host_server_mapping = itr->second;
@@ -4761,7 +4762,7 @@ void MySQL_HostGroups_Manager::read_only_action_v2(const std::list<std::tuple<st
 	unsigned long long curtime2 = monotonic_time();
 	curtime1 = curtime1 / 1000;
 	curtime2 = curtime2 / 1000;
-	proxy_info("MySQL_HostGroups_Manager::read_only_action_v2() locked for %llums\n", curtime2 - curtime1);
+	proxy_info("MySQL_HostGroups_Manager::read_only_action_v2() locked for %llums (server count:%d)\n", curtime2 - curtime1, mysql_servers.size());
 }
 
 // shun_and_killall