Error Message on Homepage

Dear Marce,

got your new Vesion 1.187 of add-link-to-FB und on my Blog-Homepage I receive the error:

Warning: Invalid argument supplied for foreach() in /homepages/14/d71175075/htdocs/_wp_s6ibl0g/wp-content/plugins/add-link-to-facebook/add-link-to-facebook-class.php on line 2544

Once your Plugin is deactivated the error is vanished.

I use WP 3.5.1, Browsers are IE 10 and Safari.
Your plugin has newly been authorized.

What is my Problem?

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https://www.ads-software.com/plugins/add-link-to-facebook/