Hi,
the fix is available for Moodle 2.6 -> Moodle 3.1, you just need to download the local_mobile version matching your Moodle version:
https://moodle.org/plugins/pluginversions.php?plugin=local_mobile
Fix: https://github.com/moodlehq/moodle-local_mobile/commits/MOODLE_30_STABLE
Regards, Juan