Ticket #40820: 40820_fix_proposal.diff

wp-includes/class-wp-theme.php

@@ -267 +267 @@
                         }
                 }
 
+                if ( ! $this->template && $this->stylesheet === $this->headers['Template']) {
+                        $this->errors = new WP_Error( 'child_theme_invalid', __( 'The theme defines itself as its parent theme. Please fix the "Template" header.' ) );
+                        $this->cache_add( 'theme', array( 'headers' => $this->headers, 'errors' => $this->errors, 'stylesheet' => $this->stylesheet ) );
+                        return;
+                }//end if
+
                 // (If template is set from cache [and there are no errors], we know it's good.)
                 if ( ! $this->template && ! ( $this->template = $this->headers['Template'] ) ) {
                         $this->template = $this->stylesheet;