[BUG] Stuck at i3lock, can't get past it

## I'm submitting a…

[x] Bug

[ ] Feature Request

[ ] Other (Please describe in detail)

## Current Behavior
Rarely, once per maybe 50 times, it just doesn't react to anything after resuming. No animation. It shows the background picture, but that's it. I have to reboot to get past it

## Expected Behavior
Shouldn't get stuck

## Reproduction Instructions
No repro. It just happens *sometimes* (rarely).

## Environment
Output of `i3lock --version`:
```
i3lock: version 2.14.1 © 2010 Michael Stapelberg
```

i3's config:
```
bindsym $mod+Shift+Delete exec systemctl suspend

exec --no-startup-id xss-lock --transfer-sleep-lock -- /home/goose/scripts/lock.sh --nofork
```

That shell script:
```
#!/bin/bash
i3lock -i /home/goose/Pictures/www-main-3.png
```