Uncaught Exception: isNan is not defined

[thamara]

Describe the issue
Trying to add a waiver causes an uncaught exception:

It's worth mentioning that besides this, the waiver window opens as expected, but without the day filled.

To Reproduce
On TTL, click on the day (e.g. click on "TUE 21" of April. The error should be displayed in a new pop up.

Expected behavior
Not to have the uncaught exception

Environment

[tupaschoal]

aahhaha caught this today too and forgot to open, I think the culprit is one of my commits :X

[NetizenAbel]

aahhaha caught this today too and forgot to open, I think the culprit is one of my commits :X

Worth nothing; this doesn't happen if you open the window from the menu. But I think you already know what's up :P

[tupaschoal]

I know where it happens, I have no clue as to why the function isn't available, but then, I haven't really debugged it for the moment.