Entering ' in a numeric input widget breaks the node

[radeusgd]

By accident I typed 8' in a number input widget and pressed enter.

Enso_nOdV18jMqh.mp4

Actual behaviour

operator3158.filter 'Grade' ( ( (Filter_Condition.Equal) ( 8 ( '))))

This led to the node becoming unparseable and display wrongly in the GUI.

Expected behaviour

The value should not be submitted, I probably should get some warning that ' is not a valid character in the numeric input.

Definitely the node should not become unparseable.