Line 76 breaks WP 3.4 and above

Please check why line 76 breaks WordPRess 3.4 and above.

Debugging I found an error in that line, so where is this $content come from, and it's not even expected/used inside the function!

After removing the variable, nothing changed, my page breaks on that point. I tried to understand your code to propose a fix but... I must be missing something.

Please fix this, you are losing rating star fast!
PS: I'd like to help you with Translating the plugin, please make it i18n
=)