Hi @cadecairos
I've seen you've fixed the currkey definition but it doesn't work on mobile yet.
After a bit of investigation it looks like uglify, in you're build system, doesn't handle properly that variable during minification process (basically it strips the definition you put and few lines below a statement try to use that variable without success, throwing the error).
This doesn't happen in my build process though, this is why it came up recently.
Long story short: I cannot fix it since it's a builder (gulp/uglify) issue, maybe it's a node_module version issue... don't know.. hope this help, though.