Hi @IFL442,
Of course I know the error, it is generic one and the logic of it is already posted in "most common errors" topic. Basically it says that you have a problem in your assignments (like a deleted / missing flight) and that blade of SPTheme is missing a failsafe.
Just check line 27 of SPTheme/modules/DisposableSpecial/widgets/assignments.blade.php and if possible try renaming that file (which will allow the default blade I shipped with DispoSpecial to be used). If the error comes up with my original blade, I can try to debug but if it is only happening on the modified ones shipped by @PaintSplasher, he may need to investigate too
{{ optional($as->flight->dpt_airport)->name ?? $as->flight->dpt_airport_id }}
This is from my original blade, it checks for the airport and uses its name, if not it uses the dpt_airport_id. But before all these optional stuff I do have a generic @if($as->flight) check, which eliminates deleted / missing flights. Looks like SPTheme version may be missing this.
Unfortunately I do not see that generic check in SPTheme version of the blade.
Either you may need to wait for Thorsten to publish an update or you can replicate my wider check manually on that blade too.
https://github.com/FatihKoz/DisposableSpecial/blob/main/Resources/views/widgets/assignments.blade.php
Hope this helps