PHP 5.3 & PHP 5.4 exit with code 255

[emilient]

I get this message on travis-ci :
The command "bin/phpunit -d display_errors=1" exited with 255.

This happens for php 5.3 and php 5.4 and works fine for 5.5 and 5.6.
I'm not running custom tests for now, it's just de EcomDev test suite that don't work.

[tkn98]

Error code 255 signals a PHP fatal error. If you can't see the error, check where STDERR goes to.