"free(): invalid pointer" when doing async searches with neovim

#### Issue description

Its not always, but I noticed that when you try doing a search that will result in a lot of entries, it first displays a weird error (its gigantic, so I will paste it below), and then it starts the async search, and whenever I switch to the search buffer, my normal buffer gets replaced with the same contents as the search buffer (minus highlighting, image showing this below), and whenever I try to close any of the buffers (by doing `:bd` or `:q`), neovim crashes and the following message appears on the console:

the neovim crash
```zsh
free(): invalid pointer
zsh: abort (core dumped) nvim
%
```

the buffer being replaced with a copy of the search buffer (it updates whenever the search buffer updates as well):

the gigantic first error:
```bash
line 2:
E315: ml_get: invalid lnum: 319
Error detected while processing function ctrlsf#async#ParseAndDrawCB[7]..ctrlsf#win#DrawIncr[11]..ctrlsf#buf#SetLine[4]..99_setbufline:
line 2:
E315: ml_get: invalid lnum: 319
Error detected while processing function ctrlsf#async#ParseAndDrawCB[7]..ctrlsf#win#DrawIncr[11]..ctrlsf#buf#SetLine[4]..99_setbufline:
line 2:
E315: ml_get: invalid lnum: 318
Error detected while processing function ctrlsf#async#NeoVimSearchCBWrapper:
line 7:
E16: Invalid range: call remove(a:data, -1)
Error detected while processing function ctrlsf#async#NeoVimSearchCBWrapper:
line 7:
E16: Invalid range: call remove(a:data, -1)
Error detected while processing function ctrlsf#async#NeoVimSearchCBWrapper:
line 7:
E16: Invalid range: call remove(a:data, -1)
Error detected while processing function 81_illuminate:
line 5:
E16: Invalid range: call s:remove_illumination()
Error detected while processing function ctrlsf#async#ParseAndDrawCB:
line 2:
E16: Invalid range: call ctrlsf#log#Debug("ConsumeResult: size=%s", len(lines))
Error detected while processing function ctrlsf#async#NeoVimSearchCBWrapper:
line 2:
E16: Invalid range: call ctrlsf#async#SearchCloseCB('unused')
E315: ml_get: invalid lnum: 285
E315: ml_get: invalid lnum: 286
E315: ml_get: invalid lnum: 287
E315: ml_get: invalid lnum: 288
E315: ml_get: invalid lnum: 289
E315: ml_get: invalid lnum: 290
E315: ml_get: invalid lnum: 291
E315: ml_get: invalid lnum: 292
E315: ml_get: invalid lnum: 293
E315: ml_get: invalid lnum: 294
E315: ml_get: invalid lnum: 295
E315: ml_get: invalid lnum: 296
E315: ml_get: invalid lnum: 297
E315: ml_get: invalid lnum: 298
E315: ml_get: invalid lnum: 299
E315: ml_get: invalid lnum: 300
E315: ml_get: invalid lnum: 301
E315: ml_get: invalid lnum: 302
E315: ml_get: invalid lnum: 303
E315: ml_get: invalid lnum: 304
E315: ml_get: invalid lnum: 305
E315: ml_get: invalid lnum: 306
E315: ml_get: invalid lnum: 307
E315: ml_get: invalid lnum: 308
E315: ml_get: invalid lnum: 309
E315: ml_get: invalid lnum: 310
E315: ml_get: invalid lnum: 311
E315: ml_get: invalid lnum: 312
E315: ml_get: invalid lnum: 313
E315: ml_get: invalid lnum: 314
E315: ml_get: invalid lnum: 315
E315: ml_get: invalid lnum: 316
E315: ml_get: invalid lnum: 317
E315: ml_get: invalid lnum: 318
E315: ml_get: invalid lnum: 319
E315: ml_get: invalid lnum: 285
E315: ml_get: invalid lnum: 286
E315: ml_get: invalid lnum: 287
E315: ml_get: invalid lnum: 288
E315: ml_get: invalid lnum: 289
E315: ml_get: invalid lnum: 290
E315: ml_get: invalid lnum: 291
E315: ml_get: invalid lnum: 292
E315: ml_get: invalid lnum: 293
E315: ml_get: invalid lnum: 294
E315: ml_get: invalid lnum: 295
E315: ml_get: invalid lnum: 296
E315: ml_get: invalid lnum: 297
E315: ml_get: invalid lnum: 298
E315: ml_get: invalid lnum: 299
E315: ml_get: invalid lnum: 300
E315: ml_get: invalid lnum: 301
E315: ml_get: invalid lnum: 302
E315: ml_get: invalid lnum: 303
E315: ml_get: invalid lnum: 304
E315: ml_get: invalid lnum: 305
E315: ml_get: invalid lnum: 306
E315: ml_get: invalid lnum: 307
E315: ml_get: invalid lnum: 308
E315: ml_get: invalid lnum: 309
E315: ml_get: invalid lnum: 310
E315: ml_get: invalid lnum: 311
E315: ml_get: invalid lnum: 312
E315: ml_get: invalid lnum: 313
E315: ml_get: invalid lnum: 314
E315: ml_get: invalid lnum: 315
E315: ml_get: invalid lnum: 316
E315: ml_get: invalid lnum: 317
E315: ml_get: invalid lnum: 318
E315: ml_get: invalid lnum: 319
```

#### Things about your system and environment

| field | value |
|:-------:|:------------------------------------:|
| os | *OS X Monterey 12.2.1* |
| vim | *NVIM v0.7.0* |
| backend | *ripgrep 13.0.0* |
| locale | *en_US.UTF-8* |

- log:

Its difficult to post the log, as there's a lot of private code as well in there... If there's anything in specific, I can try to search for it

- vimrc:

```vim
let g:ctrlsf_ackprg = 'rg'

let g:ctrlsf_auto_focus = {
\ "at": "done",
\ "duration_less_than": 1000
\ }

let g:ctrlsf_mapping = {
\ "next": "n",
\ "prev": "N",
\ "quit": "gq",
\ }

let g:ctrlsf_extra_backend_args = {
\ 'rg': '--hidden --glob "!.git/*"'
\ }
let g:ctrlsf_populate_qflist = 1

nnoremap f :CtrlSF
nnoremap f :CtrlSF
vmap f CtrlSFVwordPath
command! CSFT execute ":CtrlSFToggle"
```

- file:

Theres nothing in specific on any file, its random, I can make the same search twice, and first it breaks, and then it works fine... I noticed it usually happen on async searches, with lots of results being displayed