Index: wp-admin/includes/class-wp-debug-data.php
===================================================================
--- wp-admin/includes/class-wp-debug-data.php	(revision 55892)
+++ wp-admin/includes/class-wp-debug-data.php	(working copy)
@@ -236,13 +236,6 @@
 			$compress_css_debug = 'undefined';
 		}
 
-		// Check WP_ENVIRONMENT_TYPE.
-		if ( defined( 'WP_ENVIRONMENT_TYPE' ) && WP_ENVIRONMENT_TYPE ) {
-			$wp_environment_type = WP_ENVIRONMENT_TYPE;
-		} else {
-			$wp_environment_type = __( 'Undefined' );
-		}
-
 		$info['wp-constants'] = array(
 			'label'       => __( 'WordPress Constants' ),
 			'description' => __( 'These settings alter where and how parts of WordPress are loaded.' ),