[Basssiiie]

Several garage doors are specified by the game as "garage doors" (obviously). But this means that the game will search for those "garage doors" in the specified "garage areas". I think it crashes when the game finds out it can't move or attach to dynamic objects (SA-MP objects, doesn't need to be streamer related) instead of the static preloaded objects found in IPL files. Which means that the game will try applying code to the wrong type of object, which results in a crash.

But I'm not sure if this is the actual reason.

This isn't a SA-MP bug, as far as I know. If you try the same via SCM or Cleo, the game will crash as well.