Secret Agent Clank

[T4bMinChar5]

PPSSPP repeats this message endlessly:
57:04:642 rcp level ma I[KERNEL]: HLE/sceKernelMemory.cpp:1135 sceKernelPrintf: C:\HIG\PROJECTS\RCP1\ART\CHARACTERS\Clank\data\textures\AGENTclank_Lo.gim is a big texture (17744 bytes). Make sure this texture really needs to be bigger than 8kb.
I needed to pkill -9 PPSSPPSDL to make it stop.
I attached a savegame, when you load it, it crashes like this right away. When I start a new game, it crashes after the loading sequence (space ship flying towards a planet, then black screen).
PPSSPP version: commit cdbcc12a4efd588129af879a3b2c13668599d569 (newest from git as of writing).
The game is a .cso.
I'm running LMDE (i.e. Debian-testing-like system).
I played around with settings quite a lot, nothing changed. If I knew where the settings are saved I would have uploaded a copy of them, too.