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The std::sort function, which was not problematic until version 15.2, causes a crash, perhaps because of a modified [The performance of std::sort and std::ranges::sort was improved by up to 50% for arithmetic types (120908845)] entry in xcode 15.3. For your information, std::vector contained instances of the class I had written, and I was comparing them through a custom Comp function. However, items that should not be null are recognized as null and crash as a null reference. Please check it and return it.