VIM crashes after executing xelatex and colorscheme

Describe the bug
When there is an autocommand to change the colorscheme Vim crashes after executing xelatex.

To Reproduce
Detailed steps to reproduce the behavior:

1. Include the code below in the .vimrc file:

let g:colors = "lucius"
augroup color
    au!
    au WinEnter * exe "colorscheme ".g:colors
augroup END

set makeprg=xelatex\ \-file\-line\-error\ \-interaction=nonstopmode
nmap <leader>k :exec "silent make ".shellescape(expand('%'))<cr>

2. Load a latex file
3. Compile with <leader>k
4. Navigate to another latex file
5. Vim crashes

See report below:

Process:               MacVim [33498]
Path:                  /Applications/MacVim.app/Contents/MacOS/MacVim
Identifier:            org.vim.MacVim
Version:               8.2.2164 (169)
Code Type:             X86-64 (Native)
Parent Process:        ??? [1]
Responsible:           MacVim [33498]
User ID:               502

Date/Time:             2021-07-21 18:42:43.350 -0700
OS Version:            Mac OS X 10.15.7 (19H2)
Report Version:        12
Bridge OS Version:     4.6 (17P6610)
Anonymous UUID:        35483298-412C-44A4-AED8-52EE10686945

Sleep/Wake UUID:       A07E24BD-D769-40DF-B2B1-77023F65444C

Time Awake Since Boot: 14000 seconds
Time Since Wake:       4400 seconds

System Integrity Protection: enabled

Crashed Thread:        0  Dispatch queue: com.apple.main-thread

Exception Type:        EXC_BAD_ACCESS (SIGSEGV)
Exception Codes:       KERN_INVALID_ADDRESS at 0x000076141ecb4d88
Exception Note:        EXC_CORPSE_NOTIFY

Termination Signal:    Segmentation fault: 11
Termination Reason:    Namespace SIGNAL, Code 0xb
Terminating Process:   exc handler [33498]

VM Regions Near 0x76141ecb4d88:
    Stack                  00007000021fc000-000070000227e000 [  520K] rw-/rwx SM=COW  thread 6
--> 
    MALLOC_TINY            00007f84c8400000-00007f84c8500000 [ 1024K] rw-/rwx SM=PRV  

Application Specific Information:
objc_msgSend() selector name: retain

Expected behavior
Vim should load new file without crashing.

Environment (please complete the following information):

• Vim version: 8.2 (Dec 19 2020)
• OS: MacOS 10.15.7
• Terminal: GUI

Inizia riproducendo il crash in MacVim con il .vimrc fornito, l’autocommand colorscheme WinEnter e il mapping makeprg xelatex. Confronta il comportamento durante il caricamento di un file LaTeX, l’esecuzione di k e la navigazione verso un altro file con il report del crash di macOS. Il lavoro è completo quando la navigazione tra i file non provoca più il crash di MacVim in questo scenario.