Fixed player names not displaying

core/src/io/anuke/mindustry/entities/units/BaseUnit.java

@@ -162,6 +162,11 @@ public abstract class BaseUnit extends Unit implements ShooterTrait{
 		}
 	}
 
+	@Override
+	public boolean isValid() {
+		return super.isValid() && isAdded();
+	}
+
 	@Override
 	public Timer getTimer() {
 		return timer;