Ramadan Timetable

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We are a University Islamic Society and we use your plug in for the prayer times and before we ask our question, we’d like to thank you for all the hard work you’ve put into making the plug in as it has helped us a lot. ???? ???? ???

So essentially when activating the ramadhan timetable option, the new rows show up in the table but however just above the table is the following message:

Warning: A non-numeric value encountered in public_html/wp-content/plugins/daily-prayer-time-for-mosques/Views/TimetablePrinter.php on line 221

Could you please advise us on what to do? ???? ???? ???