Hello,

This is the third time my client crashes when I go thru a portal to the Twilight Forest, see crashlog.
crash-2020-01-19_19.59.06-client.txt

Love the mod BTW.

i am also experiencing this same bug i hope it gets fixed soon

This looks like a combination of #458 followed by #432.
Should this happen again on portal usage after updating BuildCraft (once the update is available), please post an updated crash report.