bug: sdmm crashes when closing environment with an open map

[mc-oofert]

version

2.9.0 alpha

What happened?

sdmm crashed when i closed an environment with an open map belonging it closed environment from File tab

Reproduction

1. open map
2. close environment
3. crash afaik it works if you close the map beforehand

log

2023-10-13 10.14.25.log

[mc-oofert]

ok i have no clue how this happens