This is for @steemdice1 but obviously anyone can read it.
Error: 
What I think the error is. This error has been occurring when entering decimal bets, such as .1 .5 .75 etc. All those values generate an error, however 0.1 0.5 and 0.75 do not, for that reason I believe the problem is expecting an integer to start the double. I attempted to look at your GitHub, however the formatting of the code makes it so hard to read and from there I cant recommend a solution.
To rap up, although this isn't that big of a problem, it is still a bug and probably one easy to fix.