When searching for "fooo" with the following query, the api reports an error.

https://en.m.wikipedia.org/w/api.php?action=query&format=jsonfm&generator=search&gsrinfo=totalhits%7Csuggestion&gsrlimit=24&gsrnamespace=0&gsroffset=0&gsrprop=redirecttitle&gsrsearch=fooo&gsrwhat=text&list=search&pilimit=24&piprop=thumbnail&pithumbsize=144&ppprop=wikibase_item&prop=pageprops%7Cpageimages&srinfo=suggestion&srlimit=24&srnamespace=0&sroffset=0&srprop=&srsearch=foood&srwhat=text

The error:
Exception Caught: Internal error in ApiResult::setElement: Attempting to add element suggestion=foo, existing value is foo

Context for the query parameters above: apps would like to have option for in-article search. The parameters above are intended to, in a single query, return the results and thumbnail urls and wikibase id's and list results in proper order.

Version: unspecified
Severity: normal
See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=37552