Could not parse shortcut 'null'

I get the following error in Servoy Developer.:

AWT-EventQueue-0	ERROR	com.servoy.j2db.util.Debug	Could not parse shortcut 'null'

I found the cause for this.

[attachment=0]2014-02-03_14_28_00-Servoy_Navigation_Configurator_shortcut_null_error_cause.png[/attachment]

I think a not set shortcut should not raise an error?