Crash after double-tap of Start Sharing button

Steps to reproduce:

• Goto settings > share Briar app offline
• on the first screen that shows, double tap the Start Sharing button

Expected results:

• this should be handled gracefully, either treated as single tap and proceeding onto the following screen, or staying on the same screen, or returning to the Briar settings page - but it should not crash.

Actual results:

• Briar crashes.

First identified on HTCOne M9 (API 24), Android Studio logs attached plus device crash report sent from device itself. Reproduced multiple times. Then also reproduced on Pixel2, API30crash_HTC_One_M9_24062021.txtCrash_HTC_One_M9_24062021_2.txt