Cannot edit subcircuit appearance

[wildptr]

When the button "Edit viewed circuit's subcircuit appearance" button on the toolbar is clicked, a NullPointerException is thrown:

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at com.cburch.draw.canvas.Canvas.setModel(Canvas.java:71)
at com.cburch.logisim.gui.appear.AppearanceCanvas.setModel(AppearanceCanvas.java:113)
at com.cburch.logisim.gui.appear.AppearanceCanvas.setCircuit(AppearanceCanvas.java:123)
at com.cburch.logisim.gui.appear.AppearanceView.setCircuit(AppearanceView.java:80)
(and more)

[eric8he]

Yep. I have the same issue

[thewithz]

Also having this issue.
EDIT: full stack trace
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException at com.cburch.draw.canvas.Canvas.setModel(Canvas.java:71) at com.cburch.logisim.gui.appear.AppearanceCanvas.setModel(AppearanceCanvas.java:113) at com.cburch.logisim.gui.appear.AppearanceCanvas.setCircuit(AppearanceCanvas.java:123) at com.cburch.logisim.gui.appear.AppearanceView.setCircuit(AppearanceView.java:80) at com.cburch.logisim.gui.main.Frame.setEditorView(Frame.java:397) at com.cburch.logisim.gui.menu.Popups$CircuitPopup.actionPerformed(Popups.java:141) at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022) at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2348) at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402) at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259) at javax.swing.AbstractButton.doClick(AbstractButton.java:376) at javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:842) at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(BasicMenuItemUI.java:886) at java.awt.Component.processMouseEvent(Component.java:6533) at javax.swing.JComponent.processMouseEvent(JComponent.java:3324) at java.awt.Component.processEvent(Component.java:6298) at java.awt.Container.processEvent(Container.java:2237) at java.awt.Component.dispatchEventImpl(Component.java:4889) at java.awt.Container.dispatchEventImpl(Container.java:2295) at java.awt.Component.dispatchEvent(Component.java:4711) at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4889) at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4526) at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4467) at java.awt.Container.dispatchEventImpl(Container.java:2281) at java.awt.Window.dispatchEventImpl(Window.java:2746) at java.awt.Component.dispatchEvent(Component.java:4711) at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:760) 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:733) at java.awt.EventQueue$4.run(EventQueue.java:731) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80) at java.awt.EventQueue.dispatchEvent(EventQueue.java:730) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:205) 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(EventDispatchThra:93)av at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)