Studio freezes after the addition of a Boolean attribute with no editor

While trying to add an attribute into an existing entry, Studio freezes after having shown an error.

Here is the Attribute description :

attributetype ( 1.3.6.1.4.1.4203.1.12.2.3.3.1.3 NAME 'olcSpNoPresent'
	DESC 'Omit Present phase processing'
	SYNTAX 1.3.6.1.4.1.1466.115.121.1.7
	SINGLE-VALUE
	USAGE userApplications )

Here is the message I get :

>>>Error, the configured value editor can not handle this value! <<<

At this point, I can open the preference menu, or check the schema using the Ldap Schema tab, as soon as I don't double-click on the error message. But if I do, I get a spinning ball for ever.