The way I stop this is by:
loading the game first,
loading my save,
going outside but not doing any actions,
alt-tab out (I play fullscreen),
load the trainer,
alt-tab back in and all the features work and no crashes
You might be using an outdated trainer. Do you have our latest trainer?
Save the game and try it out.
If it doesn't work out: Provide us the save game with easily repeatable instructions so we can reproduce the issue.
You have to zip/rar the file before uploading it.