Hi!!
I just read it and it's something that happened to me in several occasions.
If you copy the Publisher or Development information from pages like MobyGames or Steam, and select a bit more that the text, the tabulator must be copied (or something like that). When you paste it, shouldn't show any error, but when you save the info, is when it fails. I assume it is trying to search in Publisher/Development something named "tabulator" and cause the error from that part onwards.
In my case, by being careful, it hasn't happened again