pagelist no longer appears after installing 5.5.1

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I installed 5.5.1 from 5.4.2.1 and my page lists have stopped displaying. I am seeing the following error:

PHP Warning:  Invalid argument supplied for foreach() in /home4/fltconfe/public_html/trails/updates/concrete5.5.1/concrete/blocks/page_list/view.php on line 11


Any quick help on this or I have to revert to 5.4.2.1?

waterfeller