Ticket #39828: 39828.diff

src/wp-includes/post.php

@@ -5932 +5932 @@
                 add_post_meta( $post_id, '_pingme', '1' );
         add_post_meta( $post_id, '_encloseme', '1' );
 
-        wp_schedule_single_event(time(), 'do_pings');
+        if ( false === wp_next_scheduled( 'do_pings' ) ) {
+                wp_schedule_single_event( time(), 'do_pings' );
+        }
 }
 
 /**