diff --git a/plugins/player-tracker.user.js b/plugins/player-tracker.user.js
index 1ba99cd3..864a006a 100644
--- a/plugins/player-tracker.user.js
+++ b/plugins/player-tracker.user.js
@@ -266,6 +266,7 @@ window.plugin.playerTracker.drawData = function() {
     if(window.plugin.guessPlayerLevels !== undefined &&
        window.plugin.guessPlayerLevels.fetchLevelByPlayer !== undefined) {
       var playerLevel = window.plugin.guessPlayerLevels.fetchLevelByPlayer(pguid);
+      if (playerLevel === undefined) playerLevel = 1;  //if player level unknown, assume level 1
       if(playerLevel !== undefined) {
         title += '<span style="font-weight:bold;margin-left:10px;">Level '
           + playerLevel