diff --git a/lua/aux_code.lua b/lua/aux_code.lua
index 8ba4101..b7e4325 100644
--- a/lua/aux_code.lua
+++ b/lua/aux_code.lua
@@ -83,8 +83,8 @@ function AuxFilter.readAuxTxt(txtpath)
     local auxCodes = {}
     for line in file:lines() do
         if line ~= nil and line ~= "" then  -- 检查 line 是否为空
-            line = line:match("[^\r\n]+") -- 去掉換行符，不然 value 是帶著 \n 的
-            local key, value = line:match("([^=]+)=(.+)") -- 分割 = 左右的變數
+            local line_ = line:match("[^\r\n]+") -- 去掉換行符，不然 value 是帶著 \n 的
+            local key, value = line_:match("([^=]+)=(.+)") -- 分割 = 左右的變數
             if key and value then
                 auxCodes[key] = auxCodes[key] or {}
                 table.insert(auxCodes[key], value)
@@ -219,6 +219,7 @@ function AuxFilter.func(input, env)
 
         -- 遍歷每一個待選項
         for cand in input:iter() do
+            local cand_ = cand
             local auxCodes = AuxFilter.aux_code[cand.text] -- 僅單字非 nil
             local fullAuxCodes = AuxFilter.fullAux(env, cand.text)
 
@@ -236,7 +237,7 @@ function AuxFilter.func(input, env)
                     local shadowText = cand.text
                     local shadowComment = cand.comment
                     local originalCand = cand:get_genuine()
-                    cand = ShadowCandidate(originalCand, originalCand.type, shadowText,
+                    cand_ = ShadowCandidate(originalCand, originalCand.type, shadowText,
                         originalCand.comment .. shadowComment .. '(' .. codeComment .. ')')
                 else
                     cand.comment = '(' .. codeComment .. ')'
@@ -246,11 +247,11 @@ function AuxFilter.func(input, env)
             -- 過濾輔助碼
             if #auxStr == 0 then
                 -- 沒有輔助碼、不需篩選，直接返回待選項
-                yield(cand)
+                yield(cand_)
             elseif #auxStr > 0 and fullAuxCodes and (cand.type == 'user_phrase' or cand.type == 'phrase') and
                 AuxFilter.match(fullAuxCodes, auxStr) then
                 -- 匹配到辅助码的待选项，直接插入到候选框中( 获得靠前的位置 )
-                yield(cand)
+                yield(cand_)
             else
                 -- 待选项字词 没有 匹配到当前的辅助码，插入到列表中，最后插入到候选框里( 获得靠后的位置 )
                 -- table.insert(insertLater, cand)
diff --git a/lua/cn_en_spacer.lua b/lua/cn_en_spacer.lua
index 7d01ea7..5ce5fb1 100644
--- a/lua/cn_en_spacer.lua
+++ b/lua/cn_en_spacer.lua
@@ -21,10 +21,11 @@ end
 
 local function cn_en_spacer(input, env)
     for cand in input:iter() do
+        local cand_ = cand
         if is_mixed_cn_en_num(cand.text) then
-            cand = cand:to_shadow_candidate(cand.type, add_spaces(cand.text), cand.comment)
+            cand_ = cand:to_shadow_candidate(cand.type, add_spaces(cand.text), cand.comment)
         end
-        yield(cand)
+        yield(cand_)
     end
 end
 
diff --git a/lua/en_spacer.lua b/lua/en_spacer.lua
index 293e1ee..26879c7 100644
--- a/lua/en_spacer.lua
+++ b/lua/en_spacer.lua
@@ -7,11 +7,12 @@ local F = {}
 function F.func( input, env )
     local latest_text = env.engine.context.commit_history:latest_text()
     for cand in input:iter() do
+        local cand_ = cand
         if cand.text:match( '^[%a\']+[%a\']*$' ) and latest_text and #latest_text > 0 and
             latest_text:find( '^ ?[%a\']+[%a\']*$' ) then
-            cand = cand:to_shadow_candidate( 'en_spacer', cand.text:gsub( '(%a+\'?%a*)', ' %1' ), cand.comment )
+            cand_ = cand:to_shadow_candidate( 'en_spacer', cand.text:gsub( '(%a+\'?%a*)', ' %1' ), cand.comment )
         end
-        yield( cand )
+        yield( cand_ )
     end
 end
 
diff --git a/lua/search.lua b/lua/search.lua
index 52d5951..d8515d9 100755
--- a/lua/search.lua
+++ b/lua/search.lua
@@ -21,7 +21,6 @@ local function get_pos( text, char )
             local first_char = tmp:sub( 1, utf8.offset( tmp, 2 ) - 1 )
             if first_char == char then pos[i] = true end
             tmp = tmp:gsub( '^' .. first_char, '' )
-            i = i + 1
         end
     end
     return pos