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@NotNull method de/itemis/mps/editor/diagram/runtime/jgraph/SmartGuide_PointPair.snap must not return null
java.lang.IllegalStateException: @NotNull method de/itemis/mps/editor/diagram/runtime/jgraph/SmartGuide_PointPair.snap must not return null	at de.itemis.mps.editor.diagram.runtime.jgraph.SmartGuide_PointPair.snap(SmartGuide_PointPair.java:18)	at de.itemis.mps.editor.diagram.runtime.jgraph.AbstractSmartGuide.snap(AbstractSmartGuide.java:23)	at de.itemis.mps.editor.diagram.runtime.jgraph.MyMovePreview.snap(MyMovePreview.java:138)	at de.itemis.mps.editor.diagram.runtime.jgraph.MyMovePreview.update(MyMovePreview.java:61)	at com.mxgraph.swing.handler.mxGraphHandler.mouseDragged(mxGraphHandler.java:1057)	at de.itemis.mps.editor.diagram.runtime.jgraph.MyGraphHandler.mouseDragged(MyGraphHandler.java:51)	at java.awt.AWTEventMulticaster.mouseDragged(AWTEventMulticaster.java:320)	at java.awt.AWTEventMulticaster.mouseDragged(AWTEventMulticaster.java:319)	at java.awt.AWTEventMulticaster.mouseDragged(AWTEventMulticaster.java:319)	at java.awt.AWTEventMulticaster.mouseDragged(AWTEventMulticaster.java:319)	at java.awt.Component.processMouseMotionEvent(Component.java:6581)	at javax.swing.JComponent.processMouseMotionEvent(JComponent.java:3342)	at de.itemis.mps.editor.diagram.runtime.jgraph.MyGraphComponent$MyGraphControl.processMouseMotionEvent(MyGraphComponent.java:507)	at java.awt.Component.processEvent(Component.java:6302)	at java.awt.Container.processEvent(Container.java:2236)	at java.awt.Component.dispatchEventImpl(Component.java:4889)	at java.awt.Container.dispatchEventImpl(Container.java:2294)	at java.awt.Component.dispatchEvent(Component.java:4711)	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4888)	at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4542)	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4466)	at java.awt.Container.dispatchEventImpl(Container.java:2280)	at java.awt.Window.dispatchEventImpl(Window.java:2746)	at java.awt.Component.dispatchEvent(Component.java:4711)	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758)	at java.awt.EventQueue.access$500(EventQueue.java:97)	at java.awt.EventQueue$3.run(EventQueue.java:709)	at java.awt.EventQueue$3.run(EventQueue.java:703)	at java.security.AccessController.doPrivileged(Native Method)	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80)	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:90)	at java.awt.EventQueue$4.run(EventQueue.java:731)	at java.awt.EventQueue$4.run(EventQueue.java:729)	at java.security.AccessController.doPrivileged(Native Method)	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:728)	at com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.java:863)	at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:695)	at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:385)	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)	at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)