objective c - ios app crash say NSNull rangeOfCharacterFromSet -

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terminating app due uncaught exception 'nsinvalidargumentexception', reason: '-[nsnull rangeofcharacterfromset:]: unrecognized selector sent instance 0x30e483d0' *** first throw call stack: (0x22ebcf87 0x304dfc77 0x22ec237d 0x22ec0259 0x22ec1548 0x26665113 0x267b8e03 0x267b8ed7 0x25d5ebd1 0x25d5ea59 0x25d5e447 0x25d5e251 0x25d5815d 0x22e83845 0x22e80f29 0x22e8132b 0x22dcedb1 0x22dcebc3 0x2a133051 0x2639aa31 0x327d63 0x30a7baaf) libc++abi.dylib: terminating uncaught exception of type nsexception


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