Error with creating a Custom PDF

[Elnoggernog]

An error occured while creating a custom PDF for the crag "Hängender Stein"

I tried tracking the error further down and noticed, one sector throws an error as well ( sector "South Park"), eventhough there is a working html-PDF and instant-PDF for this sector. The sector seems fine

Link to sector: https://www.thecrag.com/en/climbing/austria/area/518697006