Invalid argument warning updating to 1.8

Upgrading chatroom from 1.7 (10 July) to 1.8 I see the following warnings.
Similar problem was reported in http://drupal.org/node/178922 for Image Assist.

    * warning: array_merge() [function.array-merge]: Argument #2 is not an array in /var/www/cms50/update.php on line 309.
    * warning: Invalid argument supplied for foreach() in /var/www/cms50/update.php on line 542.

The following queries were executed
chatroom module
Update #5

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