Use -removeDeferredKeyObserver: instead of -removeKeyObserver

Question

Can't find method with cause this log message.

2016-05-24 13:12:44.451 MYAPPNAME[33530:7289718] Use -removeDeferredKeyObserver: instead of -removeKeyObserver:

Any suggestion how to find method? Actually what is [33530:7289718] information.

What I've tried:

1. Search trough the project with key word removeKeyObserver
2. Search using this answer
3. I added breakpoints everywhere in the project where I removeObserver. Note. I searched removeObserver because I have not found removeKeyObserver word. I tried to debug it and seems it's connected to some classes where we use PHLivePhoto. But I have not found the line which call removeKeyObserver
   4. Also there is not a lot links in the web regarding this log. I found one more topic where we can see the same log.

Also I have MBProgressHud and seems there are also some related calls.

Also I found some maybe helpful link that I can use to set debug breakpoint. How can I specify breakpoint using removeKeyObserver