Filtering on 2 criteria shows blank page

[shsimeonova]

Example: https://admin.judgesoftuniorg.ml/Participants?Contest-equals=1114&-contains=cf192ceb-e9e2-4dfe-b9a1-fa4ab7ee1ee8

[MomchilSt]

Is the issue fixed, or am I testing it wrong?
Test: /Participants?ContestId-equals=3954&UserId-contains=deda82b8-17d2-4559-9382-40336615a940