Save button can be double clicked. Appends additional property 'null'.

[buckhalt]

"Save and Close" button does not disable after click and allows for double click regardless of interface type or type of change. Double click appends a 'null' property. Reproducible with any double click of save button, but an example is below:

Images show the result of a double click of the save button after adding the 'Please connect people who live together' prompt on a Sociogram interface.

This creates an invalid protocol and prevents saving of future changes.