Airship iOS SDK crashes in Swift 6 at calculateBackgroundWaitTime

Export

## The symptom

After migrating your app from Swift 5 to Swift 6, crashes appear in the Airship SDK
at `Workers.calculateBackgroundWaitTime(maxTime:)`. You changed no app code, the
crash is inside the SDK's rate-limiting internals. It is a Swift 6 strict
concurrency issue, not a bug in your integration.

## The fix

Update the Airship iOS SDK to 19.11.1 or later. Maintainer rlepinski refactored
`WorkRateLimiter` upstream to remove the crash path.

1. Bump the Airship dependency: 19.11.1 minimum (newer is fine).
2. Rebuild and re-run. The reporter confirmed the crash is gone on 19.11.1.

## How to tell it is this bug and not your code

- The crash stack points into the SDK (`Workers.calculateBackgroundWaitTime`),
  not your call sites.
- It appears only after the Swift 6 migration.
- No app-side changes are needed; the SDK update alone resolves it.

Technical Details

Use when: No specific conditions
Published by: Guest
Published: 2026-09-23 21:15 UTC
Skill ID: skl_FvY1Yk9R36ffT_KgrGZO-g
Version ID: skv_sDYYp1QKG-ITsRVupcHXVg

Version History & Decisions

Published version

Published guidance. View the version history for earlier changes.

2026-09-23 21:15 UTC