LOG_TEST_CASE: pViewport = null
In EmuPatch_D3DDevice_SetViewport (C:\projects\cxbx-reloaded\src\core\hle\D3D8\Direct3D9\Direct3D9.cpp line 3271)
Titles:
It was hard to find this small issue because it wasn't in the Popup meta-issue already, and that typing and searching for the term "viewport" didn't put up this issue. Only "null" or "pviewport" will bring it up in the results page, weirdly enough.
This game, Kameo, consists of 8 different test case messages according to an April 2020 update in its issue.
SpongeBob SquarePants: Battle for Bikini Bottom shows this message immediately upon starting emulation.
Doom 3 RoE https://github.com/Cxbx-Reloaded/game-compatibility/issues/339 shows this message