Index: addressbook/backends/file/e-book-backend-file.c
===================================================================
--- addressbook/backends/file/e-book-backend-file.c.orig
+++ addressbook/backends/file/e-book-backend-file.c
@@ -523,7 +523,7 @@ book_view_thread (gpointer data)
 	EDataBookView *book_view = data;
 	FileBackendSearchClosure *closure = get_closure (book_view);
 	if (!closure)
-		return;
+		return NULL;
 	EBookBackendFile *bf = closure->bf;
 	const char *query;
 	DB  *db;