Workspace Selection failed to refresh after closing workspace

Way to reproduce:
1) Start Gephi and open two files
2) Click on the workspace name and delete "Workspace 1"
Click on the next arrow in workspace selection throws an exception

Stack trace:

java.lang.NullPointerException
 at org.gephi.project.impl.ProjectControllerImpl.openWorkspace(ProjectControllerImpl.java:231)
 at org.gephi.ui.workspace.WorkspaceUISelectorPanel$3.actionPerformed(WorkspaceUISelectorPanel.java:83)
 at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)
 at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)
 at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
 at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
 at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:236)
 at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:272)
 at java.awt.Component.processMouseEvent(Component.java:6263)
 at javax.swing.JComponent.processMouseEvent(JComponent.java:3267)
 at java.awt.Component.processEvent(Component.java:6028)
 at java.awt.Container.processEvent(Container.java:2041)
 at java.awt.Component.dispatchEventImpl(Component.java:4630)
 at java.awt.Container.dispatchEventImpl(Container.java:2099)
 at java.awt.Component.dispatchEvent(Component.java:4460)
 at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4574)
 at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4238)
 at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4168)
 at java.awt.Container.dispatchEventImpl(Container.java:2085)
 at java.awt.Window.dispatchEventImpl(Window.java:2475)
 at java.awt.Component.dispatchEvent(Component.java:4460)