Multi-threaded core-data iOS crashing?

The main rule for multi-threaded Core Data use is "thread confinement" of managed object contexts and persistent stores. This means, it is safe to have thread-local managed object contexts but not passing them from one thread to another. If you do, you have to handle on your own locking and synchronization.

You aren't creating the context with a concurrency type, or merging changes through a parent child context relationship, so your likely problem is a threading issue. Contexts are not thread-safe, and must be accessed or mutated on the same thread that created them.

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