Ticket #20903: 20903.diff

wp-admin/includes/export.php

@@ -94 +94 @@
 
                 // put categories in order with no child going before its parent
                 while ( $cat = array_shift( $categories ) ) {
-                        if ( $cat->parent == 0 || isset( $cats[$cat->parent] ) )
+                        if ( $cat->parent == 0 || isset( $cats[$cat->parent] ) ) {
                                 $cats[$cat->term_id] = $cat;
-                        else
+                        } elseif ( term_exists( $cat->parent, 'category' ) ) {
+                                // Assume we will find the parent later
                                 $categories[] = $cat;
+                        } else {
+                                // For some reason the parent is missing
+                                $cats[$cat->term_id] = $cat;
+                        }
                 }
 
                 // put terms in order with no child going before its parent