So is it accurate that your datastructure looks something like this?

my @cleared = (
    'Something',
    {JobProfil => undef},
    {JobProfil => 1},
    'Something else that should match',
    'This one should not match',
);
[download]

Why are there hashrefs in some elements and not in others? Possibly the first test you should be doing is checking if $x contains a reference, at each iteration. Otherwise, you'll be trying to dereference $x as a hashref when it's actually just a plain old string. This would run afoul of strict 'refs';.