02_muxing stuck at 99%

[Selur]

The crash occurs during the muxing, so x264 itself probably isn't at fault.
The muxing call:

"C:\PROGRA~1\Hybrid\64bit\MP4Box.exe" -par 1=1:1 -add "C:\Users\Admin\AppData\Local\Temp\11_57_~1.264"#video:fps=29.97:delay=43:name=:lang="en" -brand avc1 -add "C:\Users\Admin\AppData\Local\Temp\IID_1_~3.AAC"#audio:lang="en" -mpeg4 -itags tool="Hybrid 2018.04.08.1" -tmp "C:\Users\Admin\AppData\Local\Temp" -new "F:\LEWDICROUS_DESIGN_WORK\HARTISANN\VIDEO_ASSETS\ASSETS_HIGHREZ\COMPLETE_FINALS\11_57_03_4710__06.mp4"

seems to be fine to.
Do you get and errors if you call that call inside a Windows command prompt?

Also try whether is works if you enable: "Config->Output->Container settings->Mp4 Settings->FFmpeg instead of MP4Box"

Cu Selur