diff --git a/changelog.txt b/changelog.txt
index 0f0d6a9..ee51b4e 100644
--- a/changelog.txt
+++ b/changelog.txt
@@ -1,3 +1,7 @@
+= 2.9.1 =
+
+* Fix: Validate hook priority values (Let's Getz Prioritized)
+
 = 2.9.0 =
 
 * Add: Support WebP image format
diff --git a/controller.php b/controller.php
index f11adb6..fceeac9 100644
--- a/controller.php
+++ b/controller.php
@@ -285,7 +285,11 @@ public function hooks_add_last( $data = null ) {
 		}
 
 		// Get lowest priority for filter.
-		$max_priority = max( array_keys( $wp_filter[ $tag ]->callbacks ) ) + 123;
+		$max_priority = max( array_keys( $wp_filter[ $tag ]->callbacks ) );
+		// Add priority offset
+		if ( $max_priority < PHP_INT_MAX ) {
+			$max_priority += min( 123, PHP_INT_MAX - $max_priority );
+		}
 
 		switch ( $tag ) {
 			case 'the_content':
diff --git a/main.php b/main.php
index 59a234b..834cb44 100644
--- a/main.php
+++ b/main.php
@@ -9,7 +9,7 @@
  * Plugin Name: Simple Lightbox
  * Plugin URI: http://archetyped.com/tools/simple-lightbox/
  * Description: The highly customizable lightbox for WordPress
- * Version: 2.9.0
+ * Version: 2.9.1
  * Requires at least: 5.3
  * Requires PHP: 5.6.20
  * Text Domain: simple-lightbox
diff --git a/package-lock.json b/package-lock.json
index c100c5d..3c246dc 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,11 +1,11 @@
 {
   "name": "simple-lightbox",
-  "version": "2.9.0",
+  "version": "2.9.1",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
-      "version": "2.9.0",
+      "version": "2.9.1",
       "license": "GPLv2",
       "devDependencies": {
         "grunt": "^1.5.3",
diff --git a/package.json b/package.json
index eb05f0c..16a6472 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "simple-lightbox",
-  "version": "2.9.0",
+  "version": "2.9.1",
   "title": "Simple Lightbox",
   "description": "The highly-customizable lightbox for WordPress",
   "author": "Archetyped <support@archetyped.com>",
diff --git a/readme.txt b/readme.txt
index 9b4abea..50a3118 100644
--- a/readme.txt
+++ b/readme.txt
@@ -65,6 +65,10 @@ Get more information on [Simple Lightbox's official page](http://archetyped.com/
 
 == Changelog ==
 
+= 2.9.1 =
+
+* Fix: Validate hook priority values (Let's Getz Prioritized)
+
 = 2.9.0 =
 
 * Add: Support WebP image format