lib/straux attempt to index a local 'str' (a nil value)

[markuman]

Lua 5.1.5  Copyright (C) 1994-2012 Lua.org, PUC-Rio
> autoswagger = require 'autoswagger.init'
> brain = autoswagger.Brain:new()
> brain:learn('GET', 'google.com', '/users/1/app/5')
./autoswagger/lib/straux.lua:8: attempt to index local 'str' (a nil value)
stack traceback:
	./autoswagger/lib/straux.lua:8: in function 'split'
	./autoswagger/lib/straux.lua:19: in function 'tokenize'
	./autoswagger/host.lua:99: in function 'insert_path'
	./autoswagger/host.lua:138: in function 'add_path'
	./autoswagger/host.lua:229: in function <./autoswagger/host.lua:228>
	(tail call): ?
	stdin:1: in main chunk
	[C]: ?
> 

[markuman]

this also happen using lua 5.2 and 5.3