diff --git a/desktop/tree_url_node.c b/desktop/tree_url_node.c
index 8472fff24..241a10603 100644
--- a/desktop/tree_url_node.c
+++ b/desktop/tree_url_node.c
@@ -629,8 +629,9 @@ static void tree_url_load_entry(dom_node *li, tree_url_load_ctx *ctx)
 	dom_node_unref(a);
 }
 
-static bool tree_url_load_directory_cb(dom_node *node, void *ctx)
+static nserror tree_url_load_directory_cb(dom_node *node, void *ctx)
 {
+	/* TODO: return appropriate errors */
 	tree_url_load_ctx *tctx = ctx;
 	dom_string *name;
 	dom_exception error;
@@ -641,7 +642,7 @@ static bool tree_url_load_directory_cb(dom_node *node, void *ctx)
 
 	error = dom_node_get_node_name(node, &name);
 	if (error != DOM_NO_ERR || name == NULL)
-		return false;
+		return NSERROR_NOMEM;
 
 	if (dom_string_caseless_lwc_isequal(name, corestring_lwc_li)) {
 		/* entry */
@@ -656,7 +657,7 @@ static bool tree_url_load_directory_cb(dom_node *node, void *ctx)
 			warn_user("TreeLoadError", "(Empty <h4> "
 					"or memory exhausted.)");
 			dom_string_unref(name);
-			return false;
+			return NSERROR_NOMEM;
 		}
 
 		if (tctx->title != NULL)
@@ -675,7 +676,7 @@ static bool tree_url_load_directory_cb(dom_node *node, void *ctx)
 		error = dom_element_get_attribute(node, corestring_dom_id, &id);
 		if (error != DOM_NO_ERR) {
 			dom_string_unref(name);
-			return false;
+			return NSERROR_NOMEM;
 		}
 
 		if (id != NULL) {
@@ -691,7 +692,7 @@ static bool tree_url_load_directory_cb(dom_node *node, void *ctx)
 				dom_string_byte_length(tctx->title));
 		if (title == NULL) {
 			dom_string_unref(name);
-			return false;
+			return NSERROR_NOMEM;
 		}
 
 		dir = tree_create_folder_node(tctx->tree, tctx->directory,
@@ -699,7 +700,7 @@ static bool tree_url_load_directory_cb(dom_node *node, void *ctx)
 		free(title);
 		if (dir == NULL) {
 			dom_string_unref(name);
-			return false;
+			return NSERROR_NOMEM;
 		}
 
 		if (dir_is_default)
@@ -732,7 +733,7 @@ static bool tree_url_load_directory_cb(dom_node *node, void *ctx)
 
 	dom_string_unref(name);
 
-	return true;
+	return NSERROR_OK;
 }
 
 /**
diff --git a/utils/libdom.c b/utils/libdom.c
index 9e7e7761a..a1465af19 100644
--- a/utils/libdom.c
+++ b/utils/libdom.c
@@ -211,7 +211,8 @@ dom_node *libdom_find_first_element(dom_node *parent, lwc_string *element_name)
 }
 
 /* exported interface documented in libdom.h */
-void libdom_iterate_child_elements(dom_node *parent, 
+/* TODO: return appropriate errors */
+nserror libdom_iterate_child_elements(dom_node *parent, 
 		libdom_iterate_cb cb, void *ctx)
 {
 	dom_nodelist *children;
@@ -220,12 +221,12 @@ void libdom_iterate_child_elements(dom_node *parent,
 
 	error = dom_node_get_child_nodes(parent, &children);
 	if (error != DOM_NO_ERR || children == NULL)
-		return;
+		return NSERROR_NOMEM;
 
 	error = dom_nodelist_get_length(children, &num_children);
 	if (error != DOM_NO_ERR) {
 		dom_nodelist_unref(children);
-		return;
+		return NSERROR_NOMEM;
 	}
 
 	for (index = 0; index < num_children; index++) {
@@ -235,15 +236,16 @@ void libdom_iterate_child_elements(dom_node *parent,
 		error = dom_nodelist_item(children, index, &child);
 		if (error != DOM_NO_ERR) {
 			dom_nodelist_unref(children);
-			return;
+			return NSERROR_NOMEM;
 		}
 
 		error = dom_node_get_node_type(child, &type);
 		if (error == DOM_NO_ERR && type == DOM_ELEMENT_NODE) {
-			if (cb(child, ctx) == false) {
+			nserror err = cb(child, ctx);
+			if (err != NSERROR_OK) {
 				dom_node_unref(child);
 				dom_nodelist_unref(children);
-				return;
+				return err;
 			}
 		}
 
@@ -251,6 +253,8 @@ void libdom_iterate_child_elements(dom_node *parent,
 	}
 
 	dom_nodelist_unref(children);
+
+	return NSERROR_OK;
 }
 
 /* exported interface documented in libdom.h */
diff --git a/utils/libdom.h b/utils/libdom.h
index 36caf01bf..dc8eacd12 100644
--- a/utils/libdom.h
+++ b/utils/libdom.h
@@ -61,9 +61,9 @@ dom_node *libdom_find_element(dom_node *node, lwc_string *element_name);
  */
 dom_node *libdom_find_first_element(dom_node *parent, lwc_string *element_name);
 
-typedef bool (*libdom_iterate_cb)(dom_node *node, void *ctx);
+typedef nserror (*libdom_iterate_cb)(dom_node *node, void *ctx);
 
-void libdom_iterate_child_elements(dom_node *parent,
+nserror libdom_iterate_child_elements(dom_node *parent,
 		libdom_iterate_cb cb, void *ctx);
 
 nserror libdom_parse_file(const char *filename, const char *encoding,