PHP Error related to mp3-jplayer

Upon logging in to my WordPress dashboard, I am alerted every couple of days to a PHP error apparently related to mp3-jplayer. The full text of the error is:

[18-Nov-2017 05:22:41 UTC] PHP Warning: strpos() [function.strpos]: Empty needle in /home/content/76/6863576/html/wp-content/plugins/mp3-jplayer/main.php on line 1219

This seems to occur only every couple of days, so perhaps it happens when a site visitor activates the player (which seems to work just fine).

However, when this error occurs, there is not just one of these entries, but usually about 16 of them in a row, with the same time stamp.

Any ideas as to what this might be?

Thanks!