From 5a9638b09b473045936dbe3c8a02e30fa85e02a6 Mon Sep 17 00:00:00 2001
From: zhongwencool <zhongwencool@gmail.com>
Date: Wed, 6 Jul 2022 17:12:11 +0800
Subject: [PATCH] fix: get subscriptions crash when subid is undefined

---
 apps/emqx_management/src/emqx_mgmt_api_subscriptions.erl | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/apps/emqx_management/src/emqx_mgmt_api_subscriptions.erl b/apps/emqx_management/src/emqx_mgmt_api_subscriptions.erl
index aa3aeb3af..3f420780f 100644
--- a/apps/emqx_management/src/emqx_mgmt_api_subscriptions.erl
+++ b/apps/emqx_management/src/emqx_mgmt_api_subscriptions.erl
@@ -122,7 +122,7 @@ format({_Subscriber, Topic, Options = #{share := Group}}) ->
     #{node => node(), topic => filename:join([<<"$share">>, Group, Topic]), clientid => maps:get(subid, Options), qos => QoS};
 format({_Subscriber, Topic, Options}) ->
     QoS = maps:get(qos, Options),
-    #{node => node(), topic => Topic, clientid => maps:get(subid, Options), qos => QoS}.
+    #{node => node(), topic => Topic, clientid => maps:get(subid, Options, ""), qos => QoS}.
 
 %%--------------------------------------------------------------------
 %% Query Function