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Core Data fetch request crashes the app

Subject: Core Data fetch request crashes the app
From: Chataka <email@hidden>
Date: Tue, 1 May 2007 13:37:42 +0900
Delivered-to: email@hidden
Delivered-to: email@hidden

I am trying to fetch an array of managed objects but sometimes it crashes my app.

-------- NSEntityDescription * entity = [NSEntityDescription entityForName: (an entity name) inManagedObjectContext: managedObjectContext];

NSFetchRequest * fetchRequest = [[NSFetchRequest alloc] init];
[fetchRequest setEntity: entity];
[fetchRequest setPredicate: (a predicate)];

NSArray * fetchedMOArray;
NSError * error;
fetchedMOArray = [managedObjectContext executeFetchRequest: fetchRequest
					error: &error];
--------

The code usually works, but when I remove a managed object through an NSArrayController (removeObject:) before executing this code, the app is crashed when the last line (executeFetchRequest: error:) is executed.

My questions are that are there any timings or conditions that fetch request is not allowed, and if there are, how can I avoid them.

Thank you.
Chataka

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