The new price/cost table is 1:500,500:500,1000:1000,2001:1500,3001:2000,6000:2500,7000:3000 unfortunately I don´t have the old ones anymore. I deactivated the module and installed price per item and I´m still getting the same error. I modified the states so you´d choose them from a drop list instead of typing them in case that was the problem, and still nothing.
I deleted everything country, zones and then input thenm again and nothing.
The php version didn´t change that I know off; either way I tested it in php 5.3 till 5.6 and 7 Still nothing works!
I´m just baffled by this cause I´ve seen other people with the same error in google search results but there´s no solution reported in any of them