Crash in CoreData (_PFExternalReferenceData)

I'm currently facing an interesting issue. A customer is reporting back that my app is crashing on launch for them. I can see the crash logs (using AppCenter for crash management), and the reason the app is crashing seems to be in CoreData:

(Attaching text for seachability, and screenshot for readability):

libsystem_platform.dylib
_platform_memmove$VARIANT$Haswell
CoreData
-[_PFExternalReferenceData initForExternalLocation:safeguardLocation:data:protectionLevel:]
CoreData
-[NSSQLSavePlan _populateRow:fromObject:timestamp:inserted:shouldAddToRowCache:]
CoreData
-[NSSQLSavePlan _createRowsForSave]
CoreData
-[NSSQLSaveChangesRequestContext executePrologue]
CoreData
-[NSSQLCore dispatchRequest:withRetries:]
CoreData
-[NSSQLCore executeRequest:withContext:error:]
CoreData
-[NSPersistentStoreCoordinator executeRequest:withContext:error:]
CoreData
-[NSPersistentStoreCoordinator _routeHeavyweightBlock:]
CoreData
-[NSPersistentStoreCoordinator executeRequest:withContext:error:]
CoreData
-[NSManagedObjectContext save:]

I have never seen that crash before, it's the first time it is appearing since CoreData has been incorporated into the app (in 2016 or so). Any hints on what could possibly be happening? I am unable to provoke the crash on my end, thus debugging is quite interesting.