Database bug: Grades 3b, 3c, 4b, 4c

Hey, I just noticed that it's possible to set grades like 3a, 3b, 3c, 4a, 4b and 4c now. Previously you only had the options 3 and 4 available. However, it doesn't work. I tried to change the grade from 4a to 4b or 4c for one of my ascents, but I just get an SQL syntax error bug. The same happens if I try 3b or 3c. If you want to keep the 3a/b/c / 4a/b/c option, please fix the bug! cheers