Apple DTS asked me for a link to the forums, so I'm adding what I know, and send them here. The crash is hard to reproduce, so this is what I know as of now: My app is a SwiftUI-app, with SwiftData I create the ModelContainer in the App-structure: var modelContainer: ModelContainer = { let modelContainer: ModelContainer let schema = Schema(versionedSchema: SchemaV7.self) let config = ModelConfiguration(cloudKitDatabase: .none) do { modelContainer = try ModelContainer( for: schema, migrationPlan: MigrationPlan.self, configurations: config ) } catch { Logger().error(Error creating model container: (error.localizedDescription)) preconditionFailure(Failed to create model container) } return modelContainer }() When I add a new Schema, the migration completes successfully, but for some users (not all), the app crashes. If I delete the app and install the same app but with no database, the app runs as normal. Migrations are done as custom migration steps, to provide logging options, but the crash happens st