Segfault when opening Options menu while NCGDMW is loaded

When NCGDMW mod is enabled, pressing Esc and clicking "Options" causes a segmentation fault. From what I heard, this might only happen if OpenMW was built with LTO enabled, but can't confirm.

I'm attaching the crash log. openmw-crash.log

OS: Arch Linux

OpenMW version: 0.49, using the openmw package from the Arch Linux repositories.