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    <p>Are you sure it's the way that you're calling the methods that's the issue and not what they contain? </p> <p>A few Questions that May Help. </p> <p>1) Are the returned strings static or are they dynamic? </p> <pre><code>NSString *string = @""; //Static </code></pre> <p>VS</p> <pre><code>NSString *string = [NSString stringWithFormat:@"%@",[NSArray objectAtIndex:0]]; // Dynamic </code></pre> <p>If it's dynamic and the input is null it could crash, example trying to get an index from a empty array. </p> <p>2) Is there any condition where one of the strings could be returned non initialized? </p> <pre><code>NSString *string; // Not Initialized </code></pre> <p>VS </p> <pre><code>NSString *string = @""; // Initialized </code></pre> <p><em><strong>EDIT</em>*</strong> </p> <p>Also now that I see the code above why are you doing a <strong>@try @catch</strong> ? </p> <p>That may work fine in PHP but in iOS it's not the way to go. Direct From Apple's Docs. </p> <blockquote> <p>"You should not use a try-catch block in place of standard programming checks for Objective-C methods. In the case of an NSArray, for example, you should always check the array’s count to determine the number of items before trying to access an object at a given index. The objectAtIndex: method throws an exception if you make an out-of-bounds request so that you can find the bug in your code early in the development cycle—you should avoid throwing exceptions in an app that you ship to users."</p> </blockquote> <p><a href="http://developer.apple.com/library/ios/#documentation/cocoa/conceptual/ProgrammingWithObjectiveC/ErrorHandling/ErrorHandling.html" rel="nofollow">http://developer.apple.com/library/ios/#documentation/cocoa/conceptual/ProgrammingWithObjectiveC/ErrorHandling/ErrorHandling.html</a></p>
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    1. POObjective C using class-methods
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    1. USKenrik March
    1. USKenrik March
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    1. COthis call could return nil (((DynamoDBAttributeValue *)[response.item objectForKey:@"UID_ID"]).s), so could this be the problem?
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    2. COYou should not be returning nil strings from the method so make sure you check your output before returning it.
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    3. COAnswer Edited to reflect new info.
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