using Jenkins ver. 2.138.2 with debian-pbuilder-plugin 1.4 when trying to build a debian package:

...

I: new cache content 'libgpg-error0_1.26-2_mips.deb' added
I: new cache content 'libxapian30_1.4.3-2+deb9u1_mips.deb' added
I: new cache content 'libblkid1_2.29.2-1+deb9u1_mips.deb' added
I: unmounting dev/ptmx filesystem
I: unmounting dev/pts filesystem
I: unmounting dev/shm filesystem
I: unmounting proc filesystem
I: unmounting sys filesystem
Output directory or source file null. This is a programming problem, please file a bug report.
Build step 'Debian Pbuilder' marked build as failure