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Hi, I am setting the attributed string to NSTextStorage and replacing it with another attributed string if need changes. I am getting crash with this stack trace: CoreFoundation CFCharacterSetIsLongCharacterMember + 0x28 UIFoundation -[NSMutableAttributedString(NSMutableAttributedStringKitAdditions) fixFontAttributeInRange:] + 0x15fc UIFoundation -[NSMutableAttributedString(NSMutableAttributedStringKitAdditions) fixAttributesInRange:] + 0x70 UIFoundation -[NSTextStorage processEditing] + 0xe0 UIFoundation -[NSTextStorage edited:range:changeInLength:] + 0x14c Foundation -[NSConcreteMutableAttributedString replaceCharactersInRange:withAttributedString:] + 0x158 UIFoundation __71-[NSConcreteTextStorage replaceCharactersInRange:withAttributedString:]_block_invoke + 0x28 UIFoundation __NSConcreteTextStorageLockedForwarding + 0x34 UIFoundation -[NSConcreteTextStorage replaceCharactersInRange:withAttributedString:] + 0x44 \ Please help with what could be the issue. I have checked that the attributed string is not nil and the font is UIFont *.