---------- Bug report ----------

Please include a description about what actions you were performing when the exception occurred:
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If possible, please send us the .ork file that caused the bug.

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---------- Exception stack trace ----------
java.lang.IllegalStateException: Unable to find a convex corner
at org.locationtech.jts.triangulate.polygon.PolygonEarClipper.compute(PolygonEarClipper.java:169)
at org.locationtech.jts.triangulate.polygon.PolygonEarClipper.triangulate(PolygonEarClipper.java:61)
at org.locationtech.jts.triangulate.polygon.ConstrainedDelaunayTriangulator.triangulatePolygon(ConstrainedDelaunayTriangulator.java:107)
at org.locationtech.jts.triangulate.polygon.ConstrainedDelaunayTriangulator.compute(ConstrainedDelaunayTriangulator.java:87)
at org.locationtech.jts.triangulate.polygon.ConstrainedDelaunayTriangulator.getTriangles(ConstrainedDelaunayTriangulator.java:77)
at info.openrocket.core.file.wavefrontobj.TriangulationHelper.generateCDTFaces(TriangulationHelper.java:82)
at info.openrocket.core.file.wavefrontobj.TriangulationHelper.constrainedDelaunayTriangulate(TriangulationHelper.java:48)
at info.openrocket.core.file.wavefrontobj.export.OBJExporterFactory.doExport(OBJExporterFactory.java:180)
at info.openrocket.swing.gui.main.BasicFrame.saveWavefrontOBJFile(BasicFrame.java:1698)
at info.openrocket.swing.gui.main.BasicFrame.saveAsWavefrontOBJ(BasicFrame.java:1685)
at info.openrocket.swing.gui.main.BasicFrame.exportWavefrontOBJAction(BasicFrame.java:1678)
at info.openrocket.swing.gui.main.RocketActions$ExportOBJAction.actionPerformed(RocketActions.java:1274)
at java.desktop/javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1972)
at java.desktop/javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2313)
at java.desktop/javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:405)
at java.desktop/javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:262)
at java.desktop/javax.swing.AbstractButton.doClick(AbstractButton.java:374)
at java.desktop/javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:1028)
at java.desktop/javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(BasicMenuItemUI.java:1072)
at java.desktop/java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:297)
at java.desktop/java.awt.Component.processMouseEvent(Component.java:6626)
at java.desktop/javax.swing.JComponent.processMouseEvent(JComponent.java:3389)
at java.desktop/java.awt.Component.processEvent(Component.java:6391)
at java.desktop/java.awt.Container.processEvent(Container.java:2266)
at java.desktop/java.awt.Component.dispatchEventImpl(Component.java:5001)
at java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2324)
at java.desktop/java.awt.Component.dispatchEvent(Component.java:4833)
at java.desktop/java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4948)
at java.desktop/java.awt.LightweightDispatcher.processMouseEvent(Container.java:4575)
at java.desktop/java.awt.LightweightDispatcher.dispatchEvent(Container.java:4516)
at java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2310)
at java.desktop/java.awt.Window.dispatchEventImpl(Window.java:2780)
at java.desktop/java.awt.Component.dispatchEvent(Component.java:4833)
at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:773)
at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:722)
at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:716)
at java.base/java.security.AccessController.doPrivileged(AccessController.java:399)
at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:86)
at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:97)
at java.desktop/java.awt.EventQueue$5.run(EventQueue.java:746)
at java.desktop/java.awt.EventQueue$5.run(EventQueue.java:744)
at java.base/java.security.AccessController.doPrivileged(AccessController.java:399)
at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:86)
at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:743)
at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203)
at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)
at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113)
at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109)
at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)