Index: src/wp-includes/functions.php
===================================================================
--- src/wp-includes/functions.php	(revision 33725)
+++ src/wp-includes/functions.php	(working copy)
@@ -2677,7 +2677,7 @@
 		$args = array( $data );
 	}
 
-	$json = call_user_func_array( 'json_encode', $args );
+	$json = @call_user_func_array( 'json_encode', $args );
 
 	// If json_encode() was successful, no need to do more sanity checking.
 	// ... unless we're in an old version of PHP, and json_encode() returned