Since v1.2.5 worked pretty well for a rather long time this version might be the last one which I release.
Description of the fixed bug:
java.lang.NullPointerException bug occurred when the phone was being rotated while initialising the Activity. The reason is that the Tread responsible for downloading and showing the available weeks continued to run and tried to show or hide the “Next week” buttons even though they didn’t exist anymore (because of the Activity recreation caused by the phone rotation). Simple null checking fixes this bug.