https://pt.wikibooks.org/wiki/Special:EditWatchlist
Error
An error has occurred.
Return to Wikilivros:Página principal.
[V2CJUQpAEEYAAHfxB1UAAAED] 2016-06-14 22:46:46: Fatal exception of type "Flow\Exception\InvalidDataException"
After reloading the page, I got
[V2CJigpAEK4AABhLXYkAAAAK] 2016-06-14 22:47:42: Fatal exception of type "Flow\Exception\InvalidDataException"
and then
[V2CJ0ApAADgAAfNTPiIAAAAF] 2016-06-14 22:48:50: Fatal exception of type "Flow\Exception\InvalidDataException"
Other watchlist pages were working fine. In particular, I was able to access
https://pt.wikibooks.org/wiki/Special:EditWatchlist/raw
After I removed the 465 Topic:**************** pages, I'm able to load the page [[Special:EditWatchlist]] without error.
This is about an InvalidDataException. We did have rare occurrences of InvalidInputException before in relation to Special:EditWatchlist: T73109: Fatal exception of type Flow\Exception\InvalidInputException when trying to view/edit watchlist. I vaguely recall that was due to an oversighted topic (or that was just a suspected cause, not sure).
I see there's also recent work on Linker by @Legoktm in T136352: Special:EditWatchlist is broken in response to a InvalidArgumentException bug, but I'm not sure if that's at all related.
Probably the same root cause as T195126: Talk page links on small number of pages are broken on the Portuguese Wikibooks
I see no instances of message:InvalidDataException AND SpecialEditWatchlist in WMF Logstash for at least 30 days. Perhaps this issue has a different error message now. Can someone familiar with the issue try to reproduce it?