Ticket #21931: 21931.5.diff

src/wp-includes/template-loader.php

@@ -84 +84 @@
          *
          * @param string $template The path of the template to include.
          */
-        if ( $template = apply_filters( 'template_include', $template ) )
+        if ( $template = apply_filters( 'template_include', $template ) ) {
                 include( $template );
+        } else if ( is_user_logged_in() ) {
+                $theme = wp_get_theme();
+                if ( $theme->errors() ) {
+                        wp_die( $theme->errors() );
+                }
+        }
         return;
 endif;