added missing check (fixes #2)

pom.xml

@@ -23,7 +23,7 @@
 
     <groupId>lol.hyper</groupId>
     <artifactId>toolstats</artifactId>
-    <version>1.2</version>
+    <version>1.2.1</version>
     <packaging>jar</packaging>
 
     <name>ToolStats</name>

src/main/java/lol/hyper/toolstats/events/EntityDamage.java

@@ -140,6 +140,9 @@ public class EntityDamage implements Listener {
 
     @EventHandler
     public void onDamage(EntityDamageByBlockEvent event) {
+        if (!(event.getEntity() instanceof LivingEntity)) {
+            return;
+        }
         LivingEntity livingEntity = (LivingEntity) event.getEntity();
         if (livingEntity instanceof Player) {
             Player player = (Player) livingEntity;