I don’t know if you’re supposed to modify core files, but I had to do it to fix the issue.
The issue is that on line 3611, $object_terms is an empty array which is then iterated and points to an object that doesn’t exist.
To fix it, go to incluses/taxonomy.php and replace lines 3612 and 3613 which should look like this:
foreach ( (array) $terms as $term )
$object_terms[$term->object_id][$term->taxonomy][] = $term;
with this updated code which checks to see if the array is not empty before iterating through it:
if (sizeof($object_terms) > 0) {
foreach ($terms as $term){
$object_terms[$term->object_id][$term->taxonomy][] = $term;
}
}
