#2 bootable checkbox brokes partition table

I tried to uncheck "bootable" on a primary partition of a data hdd (ntfs partition).
An error occured then the partition table of the disc was dead!
I shouldn't have done that, because it was a primary partition, but I think PySDM should prevent the user to do such thing.
Keep on the good work ;)
version: pysdm 0.4.1-ubuntu2