ArrayIndexOutOfBounds error on back button - happens occationally

[codenameone]

Original issue 382 created by codenameone on 2012-11-04T11:05:25.000Z:

Please clearly state whether the issue relates to a device/the simulator or
the tools.
Tested in the Simulator.

If related to a device be sure to specify exactly which device with as much
details as possible.

What steps will reproduce the problem?

1. When pressing the back command to go back from a form, sometimes it causes the null pointer exception.

What is the expected output? What do you see instead?

The previous form should be shown, instead null pointer exception is thrown.

The stack trace for it is given below:

java.lang.ArrayIndexOutOfBoundsException: 1 > 0
at java.util.Vector.insertElementAt(Vector.java:594)
at com.codename1.ui.Container.insertComponentAt(Container.java:407)
at com.codename1.ui.Container.addComponent(Container.java:426)
at com.codename1.ui.MenuBar.addCommand(MenuBar.java:992)
at com.codename1.ui.Form.addCommand(Form.java:2051)
at com.codename1.ui.util.UIBuilder.initBackForm(UIBuilder.java:1861)
at com.codename1.ui.util.UIBuilder.back(UIBuilder.java:1819)
at com.codename1.ui.util.UIBuilder.back(UIBuilder.java:1794)
at com.codename1.ui.util.UIBuilder$FormListener.actionPerformed(UIBuilder.java:2367)
at com.codename1.ui.util.EventDispatcher.fireActionSync(EventDispatcher.java:366)
at com.codename1.ui.util.EventDispatcher.fireActionEvent(EventDispatcher.java:311)
at com.codename1.ui.Form.actionCommandImpl(Form.java:1156)
at com.codename1.ui.Button.fireActionEvent(Button.java:360)
at com.codename1.ui.Button.released(Button.java:395)
at com.codename1.ui.Button.pointerReleased(Button.java:483)
at com.codename1.ui.Form.pointerReleased(Form.java:1991)
at com.codename1.ui.Component.pointerReleased(Component.java:2163)
at com.codename1.ui.Display.handleEvent(Display.java:1663)
at com.codename1.ui.Display.edtLoopImpl(Display.java:908)
at com.codename1.ui.Display.mainEDTLoop(Display.java:855)
at com.codename1.ui.RunnableWrapper.run(RunnableWrapper.java:119)
at com.codename1.impl.CodenameOneThread.run(CodenameOneThread.java:171)

What version of the product are you using? On what operating system?
On simulator, Netbeans plugin version 1.0.23

Please provide any additional information below.

Unfortunately, I don't have more exact steps for reproducing it every time, this happens during the first time when the app is started. After that the back command works as expected. Probably from the stack trace, you can see if there is a bug.

[codenameone]

Comment #1 originally posted by codenameone on 2012-11-04T19:54:03.000Z:

Thanks. Fixed in SVN.