From 3dd2084c2e0f78d27b54da151b0b570b8138f0a0 Mon Sep 17 00:00:00 2001
From: zhongwencool <zhongwencool@gmail.com>
Date: Fri, 14 Oct 2022 16:05:01 +0800
Subject: [PATCH] fix: get trace list crash when trace not initialized

---
 apps/emqx_plugin_libs/src/emqx_trace/emqx_trace.erl | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/apps/emqx_plugin_libs/src/emqx_trace/emqx_trace.erl b/apps/emqx_plugin_libs/src/emqx_trace/emqx_trace.erl
index 95e705337..e51cc8113 100644
--- a/apps/emqx_plugin_libs/src/emqx_trace/emqx_trace.erl
+++ b/apps/emqx_plugin_libs/src/emqx_trace/emqx_trace.erl
@@ -104,7 +104,10 @@ start_link() ->
 
 -spec list() -> [tuple()].
 list() ->
-    ets:match_object(?TRACE, #?TRACE{_ = '_'}).
+    case ets:info(?TRACE) of
+        undefined -> [];
+        _ -> ets:match_object(?TRACE, #?TRACE{_ = '_'})
+    end.
 
 -spec is_enable() -> boolean().
 is_enable() ->