App crashing on launch

[alessionossa]

I tried the app on several devices and on most of the the app crashes since the launch after I downloaded a video.

I tried debugging the code and I found out that the crash occurs inside this function

DownTube/DownTube/DownTube/Helpers/PersistentVideoStore.swift

Line 42 in f4f0e09

func createControllerWithFetchRequest<T>(_ fetchRequest: NSFetchRequest<T>, search: String?, isDownloaded: Bool?) -> NSFetchedResultsController<T> {

when it os called from this line

DownTube/DownTube/DownTube/Helpers/VideoManager.swift

Line 264 in f4f0e09

let streamUrls = coreDataController.fetchedVideosController.fetchedObjects?.flatMap({ $0.streamUrl }) ?? []

I especially tested this with iOS 13, but the crash often occurs also in iOS 12.

[alessionossa]

#16 temporary solution: commented code that causes the crash