From 98dc39631314a2c6c788655c617c9c45d1cce51f 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, 1 Dec 2021 17:40:32 +0800
Subject: [PATCH] fix runtime errors

---
 changelog.md                                | 1 +
 script/core/definition.lua                  | 3 +++
 script/core/diagnostics/unused-function.lua | 3 +++
 script/core/infer.lua                       | 4 ++++
 script/core/reference.lua                   | 3 +++
 5 files changed, 14 insertions(+)

diff --git a/changelog.md b/changelog.md
index 6a447922d..795991854 100644
--- a/changelog.md
+++ b/changelog.md
@@ -5,6 +5,7 @@
 * `FIX` [#825](https://github.com/sumneko/lua-language-server/issues/825)
 * `FIX` [#827](https://github.com/sumneko/lua-language-server/issues/827)
 * `FIX` [#837](https://github.com/sumneko/lua-language-server/issues/837)
+* `FIX` runtime errors
 
 ## 2.5.1
 `2021-11-29`
diff --git a/script/core/definition.lua b/script/core/definition.lua
index d77ddac1d..a1f46afc5 100644
--- a/script/core/definition.lua
+++ b/script/core/definition.lua
@@ -155,6 +155,9 @@ return function (uri, offset)
         or  src.type == 'setindex'
         or  src.type == 'tableindex' then
             src = src.index
+            if not src then
+                goto CONTINUE
+            end
             if not guide.isLiteral(src) then
                 goto CONTINUE
             end
diff --git a/script/core/diagnostics/unused-function.lua b/script/core/diagnostics/unused-function.lua
index 0e0c00038..79cb16e2f 100644
--- a/script/core/diagnostics/unused-function.lua
+++ b/script/core/diagnostics/unused-function.lua
@@ -28,6 +28,9 @@ return function (uri, callback)
     local cache = {}
     ---@async
     local function checkFunction(source)
+        if not source then
+            return
+        end
         if cache[source] ~= nil then
             return cache[source]
         end
diff --git a/script/core/infer.lua b/script/core/infer.lua
index 8da35289c..39cb8c5e7 100644
--- a/script/core/infer.lua
+++ b/script/core/infer.lua
@@ -598,6 +598,10 @@ function m.searchAndViewInfers(source, field, mark)
     end
     local infers = m.searchInfers(source, field, mark)
     local view = m.viewInfers(infers)
+    if type(view) == 'boolean' then
+        log.error('Why view is boolean?', util.dump(infers))
+        return 'any'
+    end
     return view
 end
 
diff --git a/script/core/reference.lua b/script/core/reference.lua
index 067d2e235..5e4a4cbf5 100644
--- a/script/core/reference.lua
+++ b/script/core/reference.lua
@@ -111,6 +111,9 @@ return function (uri, position)
         elseif src.type == 'table' and src.parent.type ~= 'return' then
             goto CONTINUE
         end
+        if not src then
+            goto CONTINUE
+        end
         results[#results+1] = {
             target = src,
             uri    = root.uri,