fix #529

Author: sumneko

Diff for: changelog.md

@@ -1,5 +1,8 @@
 # changelog
 
+## 1.21.1
+* `FIX` [#529](https://github.com/sumneko/lua-language-server/issues/529)
+
 ## 1.21.0
 `2021-5-7`
 * `NEW` setting: `completion.showParams`

Diff for: script/parser/ast.lua

@@ -9,7 +9,12 @@ local tableSort   = table.sort
 
 _ENV = nil
 
-local State
+local DefaultState = {
+    lua = '',
+    options = {},
+}
+
+local State = DefaultState
 local PushError
 local PushDiag
 local PushComment
@@ -1925,7 +1930,7 @@ local function init(state)
 end
 
 local function close()
-    State       = nil
+    State       = DefaultState
     PushError   = function (...) end
     PushDiag    = function (...) end
     PushComment = function (...) end