Receiving error with Custom Tables plugin

A quick and dirty “fix” would be to change line 378 in that file and cast the $qry variable to an array. It should make the error go away, however, to fix the actual cause of the problem some refactoring may need to be done. You could drop the plugin author a note.

foreach ($qry as $row) {
// becomes:
foreach ((array) $qry as $row) {