From a2c2bb6987f97788c165126ba6e41c69e08d0aee Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E6=9C=80=E8=90=8C=E5=B0=8F=E6=B1=90?= <sumneko@hotmail.com>
Date: Wed, 21 Jul 2021 16:40:05 +0800
Subject: check nil

---
 script/core/searcher.lua | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/script/core/searcher.lua b/script/core/searcher.lua
index 852f7b2a..6554779f 100644
--- a/script/core/searcher.lua
+++ b/script/core/searcher.lua
@@ -856,6 +856,9 @@ function m.searchRefsByID(status, uri, expect, mode)
 end
 
 local function prepareSearch(source)
+    if not source then
+        return
+    end
     if source.type == 'field'
     or source.type == 'method' then
         source = source.parent
-- 
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