keypress not working in non US keyboards

[ashigl]

Our application is using mousetrap 1.6.5
The shortcuts are working fine with US keyboard but is not working in non US keyboard like Russian. We tried following and both do not work:

Mousetrap.bind("c", callbackfunc);
Mousetrap.bind("c", callbackfunc, "keypress");

Please let us know how to fix this issue. We have customers complaining. TIA