Reproduce a bug when removing map and layer.
Steps to reproduce.
- Click Toggle layer button. The line layer should disappear.
- Click Toggle map layer. The map should disappear.
In step 2. the app crashes instead.
Checking if (map?.style) before removing layer and source is one (ugly) way to avoid the problem.
Setting a timeout for the call to map.remove is a bit better way, but still a work around.