Test ends with exit code 139

Nette Tester 1.6.1 is failing with exit code 139. The 1.6.0 is OK. Discovered here.

I tried to reproduce it. Successfully, but only once. I clonned the nextras/dbal repo, composer update and run vendor/bin/tester tests/cases/integration/DbalExtensionTest.phpt. It failed on first run, but never on next. Googling for 139 exit... in UNIX usually means SIGSEGV 11 (139 - 128 = 11).

~~Imho, this is the PHP bug. I'll digging deeper later.~~