Fatal error in theme.inc when print packing slip

Same Error when attempting to print a packing slip;

Fatal error: Cannot use object of type stdClass as array in /home/content/53/8013653/html/includes/theme.inc on line 813

When looking at the theme.inc file, starting on line 813 I have this:

// If a renderable array is passed as $variables, then set $variables to
// the arguments expected by the theme function.
if (isset($variables['#theme']) || isset($variables['#theme_wrappers'])) {
$element = $variables;
$variables = array();
if (isset($info['variables'])) {
foreach (array_keys($info['variables']) as $name) {
if (isset($element["#$name"])) {
$variables[$name] = $element["#$name"];
}
}
}
else {
$variables[$info['render element']] = $element;
}
}

I am using fusion with the Acquia Prosper theme.

Not sure what the problem is, any input would be greatly appreciated.

#1 indicates this was fixed. To get the fix you will have to use a -dev version dated after 10 June.

Ive just tried with beta4 and the latest dev and im still getting the same error above.

EDIT: My mistake, it was my code that was causing the error because it hadn't been updated to reflect the new changes.