Image block not saving image types array

The image types array is not being saved properly. When an image block is edited, the value of the image types is reset to NULL so it disappears.

After a bit of digging I found the offending line:
Line 586
in 'function _gallery_settings_block_save()'
$value = array_keys(array_filter($value));
Should be
$value = array_values(array_filter($value));

Thanks for a great module, keep up the good work.