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This exception has no message.
java.lang.NullPointerException: 	at nl.lxtreme.ols.client.signaldisplay.SignalDiagramController.setSelectedChannel(SignalDiagramController.java:455)	at nl.lxtreme.ols.client.signaldisplay.view.SignalView$MouseHandler.mouseMoved(SignalView.java:542)	at java.awt.Component.processMouseMotionEvent(Unknown Source)	at javax.swing.JComponent.processMouseMotionEvent(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$000(Unknown Source)	at java.awt.EventQueue$1.run(Unknown Source)	at java.awt.EventQueue$1.run(Unknown Source)	at java.security.AccessController.doPrivileged(Native Method)	at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)	at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)	at java.awt.EventQueue$2.run(Unknown Source)