fix: handle nil windows on WinResized

## Details

Issue: #455

Author: MeanderingProgrammer

CHANGELOG.md

@@ -4,9 +4,14 @@
 
 ### Features
 
+- configurable language border [b8ee8bc](https://github.com/MeanderingProgrammer/render-markdown.nvim/commit/b8ee8bcefd6f5319beb7d3df5237c68e5c5376ac)
 - change code.border to thin instead of hide if version < 0.11.0 [a706be7](https://github.com/MeanderingProgrammer/render-markdown.nvim/commit/a706be739257a6203524741da2da540bc190bbe2)
 - allow image links to use custom icons based on destination [ac3e74f](https://github.com/MeanderingProgrammer/render-markdown.nvim/commit/ac3e74ffdb0bcf7282445ac12083fb6bd44858a1)
 
+### Collaborator Shoutouts
+
+- @malasee
+
 ## 8.5.0 (2025-06-10)
 
 ### Features

doc/render-markdown.txt

@@ -1,4 +1,4 @@
-*render-markdown.txt*        For NVIM v0.11.2        Last change: 2025 June 19
+*render-markdown.txt*        For NVIM v0.11.2        Last change: 2025 June 20
 
 ==============================================================================
 Table of Contents                          *render-markdown-table-of-contents*

lua/render-markdown/core/manager.lua

@@ -44,7 +44,7 @@ function M.init()
     vim.api.nvim_create_autocmd('WinResized', {
         group = M.group,
         callback = function(args)
-            for _, win in ipairs(vim.v.event.windows) do
+            for _, win in ipairs(vim.v.event.windows or {}) do
                 local buf = env.win.buf(win)
                 if M.attached(buf) and state.get(buf).enabled then
                     ui.update(buf, win, args.event, true)

lua/render-markdown/health.lua

@@ -5,7 +5,7 @@ local state = require('render-markdown.state')
 local M = {}
 
 ---@private
-M.version = '8.5.6'
+M.version = '8.5.7'
 
 function M.check()
     M.start('version')