Using Bulwark Explorer to another coin

[Epssos]

Hi,
I'm trying to use bulwark explorer to another coin.

Code:

https://github.com/bulwark-crypto/bulwark-explorer

I was changed settings, but when blocks are syncing I've got an error:

Code:

Cannot read property 'height' of null

Do you got any idea what should I change in code to eliminate this error?