check nil

Author: sumneko

script/core/diagnostics/helper/missing-doc-helper.lua

@@ -38,16 +38,17 @@ end
 
 local function checkFunction(source, callback, commentId, paramId, returnId)
     local functionName = source.parent[1]
+    local argCount = source.args and #source.args or 0
 
-    if #source.args == 0 and not source.returns and not source.bindDocs then
+    if argCount == 0 and not source.returns and not source.bindDocs then
         callback {
             start   = source.start,
             finish  = source.finish,
             message = lang.script(commentId, functionName),
         }
     end
 
-    if #source.args > 0 then
+    if argCount > 0 then
         for _, arg in ipairs(source.args) do
             local argName = arg[1]
             if argName ~= 'self' then