#5 perpackage module (not critical) error

I'm using portage-bashrc-ng-0.14.1.

Using perpackage module in conjunction with package.features, i have a little error:

/etc/portage/package.features contains

category/package splitdebug

when i run the emerge (or just ebuild package.ebuild <any operation>) i have:

...
* Found FEATURES 'splitdebug' in //etc/portage/package.features: altering FEATURES ...
/usr/share/portage-bashrc-ng//perpackage.module: line 176: [: -eq: unary operator expected [ ok ]
* Active FEATURES = ccache distlocks metadata-transfer sandbox sfperms strict splitdebug splitdebug
...

The offending line is:

if [ $itsafeature -eq 0 ]