if (!userdiff)
                userdiff = userdiff_find_by_name("default");
        if (opt->flags.allow_textconv)
-               textconv = userdiff_get_textconv(userdiff);
+               textconv = userdiff_get_textconv(opt->repo, userdiff);
 
        /* Read the result of merge first */
        if (!working_tree_file)