diff --git src/bp-groups/classes/class-bp-group-extension.php src/bp-groups/classes/class-bp-group-extension.php
index 208e2ff..c51b9ed 100644
--- src/bp-groups/classes/class-bp-group-extension.php
+++ src/bp-groups/classes/class-bp-group-extension.php
@@ -752,9 +752,10 @@ class BP_Group_Extension {

 			// When we are viewing the extension display page, set the title and options title.
 			if ( bp_is_current_action( $this->slug ) ) {
+				$name = $this->name;
 				add_filter( 'bp_group_user_has_access',   array( $this, 'group_access_protection' ), 10, 2 );
-				add_action( 'bp_template_content_header', create_function( '', 'echo "' . esc_attr( $this->name ) . '";' ) );
-				add_action( 'bp_template_title',          create_function( '', 'echo "' . esc_attr( $this->name ) . '";' ) );
+				add_action( 'bp_template_content_header', function() use ( $name ) { echo esc_attr( $name ); } );
+				add_action( 'bp_template_title',          function() use ( $name ) { echo esc_attr( $name ); } );
 			}
 		}
@@ -1184,11 +1189,23 @@ class BP_Group_Extension {
 	public function _meta_box_display_callback() {
 		$group_id = isset( $_GET['gid'] ) ? (int) $_GET['gid'] : 0;
 		$screen   = $this->screens['admin'];
-
+		$slug     = $this->slug;
 		add_meta_box(
 			$screen['slug'],
 			$screen['name'],
-			create_function( '', 'do_action( "bp_groups_admin_meta_box_content_' . $this->slug . '", ' . $group_id . ' );' ),
+			function() use ( $slug, $group_id ) {
+
+				/**
+				 * Fires as part of the add_meta_box callback.
+				 *
+				 * Note this is a dynamic action that relies on the current extension slug.
+				 *
+				 * @since 1.7.0
+				 *
+				 * @param int $group_id Current group ID.
+				 */
+				do_action( 'bp_groups_admin_meta_box_content_{$slug}', $group_id );
+			},
 			get_current_screen()->id,
 			$screen['metabox_context'],
 			$screen['metabox_priority']