fix

src/main/java/me/bobert/netneutrality/music/TrackScheduler.java

@@ -209,7 +209,7 @@ public class TrackScheduler {
             java.util.Map<String, Object> payload = new java.util.HashMap<>();
             payload.put("track", trackPayload(track));
             payload.put("message", exception.getMessage());
-            payload.put("severity", exception.getSeverity().name());
+            payload.put("severity", exception.getSeverity() != null ? exception.getSeverity().name() : null);
             manager.getEvents().publish(MusicEvent.of(MusicEvent.Type.TRACK_ERROR, guild.getId(), payload));
         }