Crash when set ringtone at stopwacth option if screen rotate

expexted behavior

Should the user replace the ringtone in the stopwatch, the user can replace it in any mode

Actual behavior

When the user wants to change the ringtone in the stopwatch then the user rotates the screen and press okey then this application will crash

How to reproduce

• download simple clock from playstore
  -launch the app
• slide to stopwatch the section
• chose at ringtone option
• and then rotate your screen posisition
• and then click okey and look if the app crashed

• Browser: sinple clock v 3.1.3
• Operating system: abdroid 5.0 lg 3

Recording Of The Bug