Question

i’ve got the following crash log error in my app:

-[NSNull length]: unrecognized selector sent to instance 0x194adc8

How do i read this? Does it mean that:

• I sent a ‘length’ message to a ‘NSNull‘ object?
• The ‘length’ method in the ‘NSNull‘ class crashed when trying to call a selector on another class?

Also, if it is the former option, how can i get the stack trace to see which function caused this crash? That top line is the only error in my log.

Thanks

Answer 1

Door 1

NSNull does not respond to length

You can check the documentation for NSNull to see that this is the case.

Without having an idea of what your code base is doing I am not sure where to look, you must be calling [NSNull null]; at some point to get the NSNull object or you are using a framework somewhere that returns this.