FIFO is overflown by GatherPipe, CPU thread is too fast! (4.0-926)

[DagmarDestroyerofWorlds]

I started having this issue this past Christmas with NiGHTS: Journey of Dreams, specifically the "My Dream" garden with all my Nightopians. Any time I enter the garden this error will pop up repeatedly and cause slowdown for a bit. It does go away if I click "Yes" but I'm worried that it will actually crash the emulator at some point, especially since it's been popping up more frequently. Other parts of the game remain unaffected.

Using dev build 4.0-8392, Open GL backend, Native internal resolution, no AA, AF 1x
PC specs listed on my profile

Edit: tried the latest dev build from the site, problem's still occurring