diff --git a/includes/ConvertToBlocks/MigrationAgent.php b/includes/ConvertToBlocks/MigrationAgent.php
index a5c319e..7aed24f 100644
--- a/includes/ConvertToBlocks/MigrationAgent.php
+++ b/includes/ConvertToBlocks/MigrationAgent.php
@@ -205,7 +205,7 @@ public function get_posts_to_update( $opts = [] ) {
 	 */
 	public function has_ctb_client_param() {
 		// phpcs:disable
-		$ctb_client = sanitize_text_field( isset( $_GET['ctb_client'] ) ? $_GET['ctb_client'] : '' ) ;
+		$ctb_client = sanitize_text_field( $_GET['ctb_client'] ?? '' );
 		// phpcs:enable
 		$ctb_client = intval( $ctb_client );