Issue search using negative filter doesn't work

Hi,

Since upgrading from 15.4.* to 15.5.4, we cannot use the negative filter to find an issue

Example in the issue list :

The filter “Assignee = david” work but “Assignee != david” show this error :

An error occurred while loading issues

In our log, we have some error too :

NoMethodError (undefined method `delete’ for #Types::Issues::NegatedIssueFilterInputType:0x00007fc87e4e33a8):

POST /api/graphql

{“errors”:[{“message”:“Internal server error”}]}

Has anyone experienced the same errors on 15.5.*?

Hi !

Same issue and behavior here with 15.5.3.