Error when setting continuous variable data ranges

[Shoeboxam]

When setting the lower and upper bounds of continuous variables, from modal on page load, an exception is thrown in the onchange callback for the text box.

Uncaught TypeError: Cannot read property '0' of undefined
    at epsilon_table_validation (interface.js?t=945426:2502)
    at ValidateInput (interface.js?t=945426:2490)
    at HTMLInputElement.onchange ((index):1)

The relevant line is:
var type_chosen = inputted_metadata[variable][0];
The variable inputted_metadata is an empty object.