I don't have any code implemented in view controller to set the font or attributedLabel. But I'm seeing crash with below reason.
*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: -[_SwiftValue pointSize]: unrecognized selector sent to instance 0x610001040ba0
There is another way of debugging issue. When app is crashed, check left panel and you will observe threads stack. In that find out Obj_exception_throw select that and use your logging area to run command po $arg1. This may give you the correct reason for crashing.
Or else, you can try using Application Unit tests for verifying all your IBOutlets and objects, loaded from NIBs.
You can select that xib and open it as source code.
Or search tho whole project to find that.