diff --git a/.github/ISSUE_TEMPLATE/bug_report.md b/.github/ISSUE_TEMPLATE/bug_report.md
index 35cfabd..1ed1773 100644
--- a/.github/ISSUE_TEMPLATE/bug_report.md
+++ b/.github/ISSUE_TEMPLATE/bug_report.md
@@ -8,7 +8,7 @@ about: Report bugs of PlaceholderAPI with this template
 [Request change (PlaceholderAPI)]: https://github.com/PlaceholderAPI/PlaceholderAPI/issues/new?template=change_request_placeholderapi.md
 [Spigot]: https://www.spigotmc.org/resources/6245/
 [Jenkins]: http://ci.extendedclip.com/job/PlaceholderAPI/
-[issue]: https://github.com/PlaceholderAPI/PlaceholderAPI/issues
+[issues]: https://github.com/PlaceholderAPI/PlaceholderAPI/issues
 
 ## Please read
 This template is only for reporting bugs of PlaceholderAPI!  
diff --git a/pom.xml b/pom.xml
index 89b4660..bb3fe40 100644
--- a/pom.xml
+++ b/pom.xml
@@ -6,7 +6,7 @@
   <groupId>me.clip</groupId>
   <artifactId>placeholderapi</artifactId>
 
-  <version>2.10.3-DEV-${BUILD_NUMBER}</version>
+  <version>2.10.5-DEV-${BUILD_NUMBER}</version>
   <name>PlaceholderAPI</name>
   <description>An awesome placeholder provider!</description>
   <url>http://extendedclip.com</url>
diff --git a/src/main/java/me/clip/placeholderapi/PlaceholderAPI.java b/src/main/java/me/clip/placeholderapi/PlaceholderAPI.java
index 368f3f2..fd29b7f 100644
--- a/src/main/java/me/clip/placeholderapi/PlaceholderAPI.java
+++ b/src/main/java/me/clip/placeholderapi/PlaceholderAPI.java
@@ -345,12 +345,13 @@ public class PlaceholderAPI {
   }
 
   public static boolean registerExpansion(PlaceholderExpansion ex) {
-    if (registerPlaceholderHook(ex.getIdentifier(), ex)) {
-      Bukkit.getPluginManager().callEvent(new ExpansionRegisterEvent(ex));
-      return true;
+    ExpansionRegisterEvent ev = new ExpansionRegisterEvent(ex);
+    Bukkit.getPluginManager().callEvent(ev);
+    if (ev.isCancelled()) {
+      return false;
     }
-
-    return false;
+    
+    return registerPlaceholderHook(ex.getIdentifier(), ex);
   }
 
   public static boolean unregisterExpansion(PlaceholderExpansion ex) {
diff --git a/src/main/java/me/clip/placeholderapi/events/ExpansionRegisterEvent.java b/src/main/java/me/clip/placeholderapi/events/ExpansionRegisterEvent.java
index 1b828dc..f493bd6 100644
--- a/src/main/java/me/clip/placeholderapi/events/ExpansionRegisterEvent.java
+++ b/src/main/java/me/clip/placeholderapi/events/ExpansionRegisterEvent.java
@@ -21,13 +21,16 @@
 package me.clip.placeholderapi.events;
 
 import me.clip.placeholderapi.expansion.PlaceholderExpansion;
+import org.bukkit.event.Cancellable;
 import org.bukkit.event.Event;
 import org.bukkit.event.HandlerList;
 
-public class ExpansionRegisterEvent extends Event {
+public class ExpansionRegisterEvent extends Event implements Cancellable {
 
   private static final HandlerList HANDLERS = new HandlerList();
   private final PlaceholderExpansion expansion;
+  private boolean isCancelled;
+
 
   public ExpansionRegisterEvent(PlaceholderExpansion expansion) {
     this.expansion = expansion;
@@ -45,4 +48,14 @@ public class ExpansionRegisterEvent extends Event {
   public PlaceholderExpansion getExpansion() {
     return expansion;
   }
+
+  @Override
+  public boolean isCancelled() {
+    return isCancelled;
+  }
+
+  @Override
+  public void setCancelled(boolean b) {
+    this.isCancelled = b;
+  }
 }
diff --git a/src/main/java/me/clip/placeholderapi/expansion/PlaceholderExpansion.java b/src/main/java/me/clip/placeholderapi/expansion/PlaceholderExpansion.java
index 64b608d..9c6ad16 100644
--- a/src/main/java/me/clip/placeholderapi/expansion/PlaceholderExpansion.java
+++ b/src/main/java/me/clip/placeholderapi/expansion/PlaceholderExpansion.java
@@ -98,7 +98,7 @@ public abstract class PlaceholderExpansion extends PlaceholderHook {
    */
   public boolean isRegistered() {
     Validate.notNull(getIdentifier(), "Placeholder identifier can not be null!");
-    return PlaceholderAPI.getRegisteredIdentifiers().contains(getIdentifier());
+    return PlaceholderAPI.isRegistered(getIdentifier());
   }
 
   /**
diff --git a/src/main/resources/plugin.yml b/src/main/resources/plugin.yml
index 37f5330..3394896 100644
--- a/src/main/resources/plugin.yml
+++ b/src/main/resources/plugin.yml
@@ -1,6 +1,7 @@
 name: ${project.name}
 main: me.clip.placeholderapi.PlaceholderAPIPlugin
 version: ${project.version}
+api-version: 1.13
 authors: [extended_clip, Glare]
 description: ${project.description}
 permissions: