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diff --git a/include/conversation.php b/include/conversation.php
index 5e764e67069489dd31486ff9e2dc7ae42dd74a6f..c9571072209682f54d711fd8777bf4bb2a2ef8a2 100644 (file)
--- a/include/conversation.php
+++ b/include/conversation.php
@@ -1536,8 +1536,8 @@ function conv_sort(array $item_list, $order)
         */
        foreach ($parents as $i => $parent) {
                $parents[$i]['children'] =
-                       get_item_children($item_array, $parent, $thread_allowed)
-                       + get_item_children($item_array, $parent, false);
+                       array_merge(get_item_children($item_array, $parent, $thread_allowed),
+                               get_item_children($item_array, $parent, false));
        }
 
        foreach ($parents as $i => $parent) {