Ready API 1.8.0 SoapUI NG PRO: Unable to open Preferences

Hi

After running tests with groovy scripts,  the Preferences window will not open. As a workaround, I had to restart the software again to make it work.  

The likelihood of this issue occurs 3-5 times a day since I updated from Ready API 1.7.0

Please see Error log below:

Thu Aug 25 11:16:15 NZST 2016:ERROR:java.lang.NullPointerException
   java.lang.NullPointerException
   	at com.eviware.soapui.actions.SoapUIPreferencesAction.show(SoapUIPreferencesAction.java:196)
   	at com.eviware.soapui.actions.SoapUIPreferencesAction.actionPerformed(SoapUIPreferencesAction.java:183)
   	at com.eviware.soapui.support.action.support.WrapperSoapUIAction.perform(WrapperSoapUIAction.java:23)
   	at com.eviware.soapui.support.action.swing.SwingActionDelegate.actionPerformed(SwingActionDelegate.java:128)
   	at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
   	at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
   	at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
   	at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
   	at javax.swing.AbstractButton.doClick(Unknown Source)
   	at javax.swing.plaf.basic.BasicMenuItemUI.doClick(Unknown Source)
   	at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(Unknown Source)
   	at java.awt.Component.processMouseEvent(Unknown Source)
   	at javax.swing.JComponent.processMouseEvent(Unknown Source)
   	at java.awt.Component.processEvent(Unknown Source)
   	at java.awt.Container.processEvent(Unknown Source)
   	at java.awt.Component.dispatchEventImpl(Unknown Source)
   	at java.awt.Container.dispatchEventImpl(Unknown Source)
   	at java.awt.Component.dispatchEvent(Unknown Source)
   	at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
   	at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
   	at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
   	at java.awt.Container.dispatchEventImpl(Unknown Source)
   	at java.awt.Window.dispatchEventImpl(Unknown Source)
   	at java.awt.Component.dispatchEvent(Unknown Source)
   	at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
   	at java.awt.EventQueue.access$500(Unknown Source)
   	at java.awt.EventQueue$3.run(Unknown Source)
   	at java.awt.EventQueue$3.run(Unknown Source)
   	at java.security.AccessController.doPrivileged(Native Method)
   	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
   	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
   	at java.awt.EventQueue$4.run(Unknown Source)
   	at java.awt.EventQueue$4.run(Unknown Source)
   	at java.security.AccessController.doPrivileged(Native Method)
   	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
   	at java.awt.EventQueue.dispatchEvent(Unknown Source)
   	at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
   	at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
   	at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
   	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
   	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
   	at java.awt.EventDispatchThread.run(Unknown Source)

I tried looking for any existing/similar issue and this is what I can only find (message posted last 2007):

https://community.smartbear.com/t5/SoapUI-Open-Source/Eclipse-Plugin-cannot-view-preferences/m-p/5644/highlight/true#M3144

Cheers