Explicitly ignore cancelled events to prevent extra drops.

plugin.yml

@@ -5,7 +5,7 @@ authors: [totemo, bermudalocket]
 description: ${project.description}
 website: ${project.url}
 main: nu.nerd.safecrystals.SafeCrystals
-api-version: 1.13
+api-version: 1.15
 
 depend: [WorldGuard]
 

pom.xml

@@ -4,7 +4,7 @@
 	<groupId>nu.nerd</groupId>
 	<name>SafeCrystals</name>
 	<artifactId>${project.name}</artifactId>
-	<version>1.0.3</version>
+	<version>1.0.4</version>
 	<packaging>jar</packaging>
 	<description>Prevent Ender Crystals from exploding and breaking blocks or damaging entities.</description>
 	<url>https://github.com/totemo/${project.name}</url>
@@ -30,7 +30,7 @@
 		<dependency>
 			<groupId>org.spigotmc</groupId>
 			<artifactId>spigot-api</artifactId>
-			<version>1.13-R0.1-SNAPSHOT</version>
+			<version>1.15.2-R0.1-SNAPSHOT</version>
 		</dependency>
 		<dependency>
 			<groupId>com.sk89q.worldguard</groupId>

src/nu/nerd/safecrystals/SafeCrystals.java

@@ -80,7 +80,7 @@ public void onEntityExplode(EntityExplodeEvent event) {
      * If the damager is a player who can build, drop the crystal as an item.
      * Projectiles are handled the same as the player who shot them.
      */
-    @EventHandler()
+    @EventHandler(ignoreCancelled = true)
     public void onEntityDamageByEntity(EntityDamageByEntityEvent event) {
         Entity entity = event.getEntity();
         if (entity.getType() == EntityType.ENDER_CRYSTAL) {
@@ -110,7 +110,7 @@ public void onEntityDamageByEntity(EntityDamageByEntityEvent event) {
      * when the player clicks the sides or underside of the block. Therefore, we
      * always check build permissions <i>above</i> the clicked block.
      */
-    @EventHandler()
+    @EventHandler(ignoreCancelled = true)
     public void onPlayerInteract(PlayerInteractEvent event) {
         if (event.getMaterial() == Material.END_CRYSTAL && event.getAction() == Action.RIGHT_CLICK_BLOCK) {
             Block destination = event.getClickedBlock().getRelative(BlockFace.UP);