I couldn't replicate this particular crash in my machine with Eigen 3.3beta1, but I guess where the error is and have pushed a patch. The package is now in mentors: [1].
I tested it 100% on my local system and in a pbuild (sid) environment, without any problem, so hopefully this one will make it! Cheers, [1] https://mentors.debian.net/debian/pool/main/m/mrpt/mrpt_1.4.0-7.dsc
