Crash on background launch after reboot, before first unlock (iPhone 18 Pro, iOS 27.0, Loop 3.14.8) #2539

Describe the bug
Loop crashes when iOS launches it in the background shortly after the iPhone restarts, before the phone has been unlocked for the first time. Fresh install; no pump or CGM configured yet. Two crash reports with the same crash location:

• Exception: EXC_BREAKPOINT / SIGTRAP (Trace/BPT trap: 5) on main thread
• procRole: Non UI (background launch)
• Device uptime at crash: 18 s and 17 s
• isLocked: 1, wasUnlockedSinceBoot: 0
• Crash ~2 s after process launch

Loop + 605616
Loop + 1512264
Loop + 1508556
+[UIScene _sceneForFBSScene:create:withSession:connectionOptions:]
-[UIApplication _connectUISceneFromFBSScene:transitionContext:]

Attach an Issue Report
Loop Issue Report attached, plus both .ips crash reports (zipped).

To Reproduce
Steps to reproduce the behavior (suspected):

1. Fresh install of Loop 3.14.8 (2), onboarding complete, no pump/CGM added
2. Restart the iPhone
3. Leave it locked for ~20 seconds
4. Loop crashes in the background; after unlocking, it launches normally

Expected behavior
Loop should wait until protected data is available instead of crashing on a background launch before first unlock.

Screenshots
N/A. Crash reports attached instead.

Phone

• Hardware: iPhone 18 Pro (iPhone19,2)
• OS Version: iOS 27.0 (24A437)

Loop Version

• Version Number: 3.14.8 (2)
• Repo: LoopKit/LoopWorkspace main, Browser Build via TestFlight

CGM

• Device: None configured yet (Dexcom G7 planned)
• Manager app: Dexcom G7 app (not yet added to Loop)

Pump

• Manufacturer: None configured yet (Insulet Omnipod 5 planned)
• Model: N/A
• Firmware version: N/A

Additional context
Loop binary UUID (both reports): 824359AD-537E-3803-85BD-60434FDCBCC3

Incidents:

1. 2026-09-27 10:37:44 +0100 — 698B9963-40BA-4BE4-8B2F-C1154606D06C
2. 2026-09-27 11:35:49 +0100 — 0D479B3C-6F17-4673-BCEB-76AF6A9CB665

I'm not sure whether these restarts were manual or whether the phone restarted by itself. I'll update this issue once I know.

Loop-crash-reports-2026-09-27.zip