Index: wp-content/themes/twentyseventeen/functions.php
===================================================================
--- wp-content/themes/twentyseventeen/functions.php	(revision 39710)
+++ wp-content/themes/twentyseventeen/functions.php	(working copy)
@@ -232,6 +232,7 @@
 }
 add_action( 'template_redirect', 'twentyseventeen_content_width', 0 );
 
+if ( ! function_exists( 'twentyseventeen_fonts_url' ) ) :
 /**
  * Register custom fonts.
  */
@@ -260,6 +261,7 @@
 
 	return esc_url_raw( $fonts_url );
 }
+endif;
 
 /**
  * Add preconnect for Google Fonts.