Possible bug when using // in fractions #1

For information as not sure it is a bug. I went to base conversion and put in 12 decimal. then went to fractions and put in 2 then / but the keyboard added 2x/ The app locked up so I closed it. I went to repeat and second time I did base conversion followed by fractions but this time I added 2/5/ and it locked up and I closed it. Third time I did same as second it locked up but when closing it went full screen but blank and closed. I tried again but so far cannot repeat it anymore.

Thanks for great useful app.