Houdini - Renderer returned non-zero error code, 139

This is still happening in Houdini 19.5.569.
The moment I call hou.fileReferences from hython, it crashes with

+0x27699265 [PRM_Template::buildChannelNames] C:\Program Files\Houdini19.5.569NoVray\bin\libPRM.dll
+0x2762e879 [PRM_Template::getChannelToken] C:\Program Files\Houdini19.5.569NoVray\bin\libPRM.dll
+0x18013f822 [HOMF_Module::fileReferences] C:\Program Files\Houdini19.5.569NoVray\bin\libHOMF.dll
+0x4de87323 C:\PROGRA~1\HOUDIN~1.569\houdini\python3.9libs\_hou.pyd
...

Currently investigating the scene. There are parameter nodes for this, connected to the VOP.

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