"add new vechicle" appears to fail, but actually succeeds

When I click "submit" on the "add new vehicle" dialog, the dialog box does not close. I can click the button a bunch of times and then if I refresh I will have a bunch of vehicles. There is a javascript error in the console: 

TypeError: Cannot read property 'data' of undefined
    at scripts.min.0f37340467.js:19

I'm using Chrome 46.
