Ok, I did edit the lines (430 and 440 in the 1.8.3 version). I installed this a while ago and was not aware of the bug.
The good news are that there is a solution, the bad news are that I actually will have to update the lines in every update.
Of all Facebook plugins I tested SFC is the best one, for functionality and design. And for Galleries I do like this one (updating all my current galleries would be a enormous task to do).