Fix NullPointerException

.gitignore

@@ -3,3 +3,4 @@
 target
 server
 build.sh
+.idea/

src/main/java/com/rooxchicken/dupepatch/DupePatch.java

@@ -18,9 +18,11 @@ public class DupePatch extends JavaPlugin implements Listener
     }
 
     @EventHandler
+    @SuppressWarnings("unused")
     public void preventDupe(PlayerEditBookEvent event)
     {
-        if(event.getNewBookMeta().getTitle().length() > 15)
+        final String title = event.getNewBookMeta().getTitle();
+        if(title != null && title.length() > 15)
         {
             event.setCancelled(true);
             Bukkit.getLogger().log(Level.WARNING, "Player " + event.getPlayer().getName() + " is attempting to dupe!");

src/main/resources/plugin.yml

@@ -1,4 +1,4 @@
 main: com.rooxchicken.dupepatch.DupePatch
 name: BookAndQuillDupePatch
-version: 1.0
+version: 1.1
 api-version: '1.21'