Hey @Rolf.
For the item, yes, the name can't be present twice, or the second added will overlap the first one.
For the quest, somebody make me the same return yesterday, haven't had time to fix it yet, but you can fix it easily by removing the line "erasequest 13994" from your script file on line 128.
On the other hand, this shouldn't break anything at all, you'll have an error with no influence on the script remaining. What's broken after that?
ps: always prefer my collection topic, the scripts there are more uptodate, and easier for me to maintain and provide, so I'll change the files there