java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at org.apache.wicket.ajax.form.AjaxFormChoiceComponentUpdatingBehavior.renderHead(AjaxFormChoiceComponentUpdatingBehavior.java:71)
at org.apache.wicket.Component.renderHead(Component.java:2266)
at org.apache.wicket.markup.html.internal.HtmlHeaderContainer$1.component(HtmlHeaderContainer.java:209)
at org.apache.wicket.MarkupContainer.visitChildren(MarkupContainer.java:843)
at org.apache.wicket.MarkupContainer.visitChildren(MarkupContainer.java:858)

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