mod_admin_shell: Tighten up type checks to fix #1754 (thanks clouded) Due to the dummy statistics provider (see core.statsmanager line 250) having a metatable that allows infinite indexing where everything is always the same table, which end up in suf() in the concatenation line.

module:log("error", "mod_pep_plus has been renamed to mod_pep, please update your config file. Auto-loading mod_pep...");
module:depends("pep");