Index: src/wp-includes/post.php
===================================================================
--- src/wp-includes/post.php	(revision 52737)
+++ src/wp-includes/post.php	(working copy)
@@ -2912,7 +2912,7 @@
 	$updated  = false;
 
 	if ( ! is_array( $stickies ) ) {
-		$stickies = array( $post_id );
+		$stickies = array();
 	} else {
 		$stickies = array_unique( array_map( 'intval', $stickies ) );
 	}