todayMarker is null -- React Issue

[prof-xed]

I tried to follow the code to know from where it will be null and as i saw you are getting it from the state and the state is null, so in thiscase offcourse it will be, I couldn't figure it out because i don't know what it suppose to do.
But if there is something will have a null value in some point it should be better to have it with a conditional checking.

[mkruijt]

issue 2