When popUp is closed application crashes on Android

undefined
at mx.styles::StyleProtoChain$/getTypeHierarchy()[/Users/erik/Documents/ApacheFlex/git/flex-sdk4.14.1/frameworks/projects/framework/src/mx/styles/StyleProtoChain.as:844]
at mx.styles::StyleProtoChain$/matchesCSSType()[/Users/erik/Documents/ApacheFlex/git/flex-sdk4.14.1/frameworks/projects/framework/src/mx/styles/StyleProtoChain.as:791]
at mx.core::UIComponent/matchesCSSType()[/Users/erik/Documents/ApacheFlex/git/flex-sdk4.14.1/frameworks/projects/framework/src/mx/core/UIComponent.as:11434]
at mx.styles::CSSSelector/matchesStyleClient()[/Users/erik/Documents/ApacheFlex/git/flex-sdk4.14.1/frameworks/projects/framework/src/mx/styles/CSSSelector.as:250]
at mx.styles::CSSStyleDeclaration/matchesStyleClient()[/Users/erik/Documents/ApacheFlex/git/flex-sdk4.14.1/frameworks/projects/framework/src/mx/styles/CSSStyleDeclaration.as:522]
at mx.styles::StyleProtoChain$/matchStyleDeclarations()[/Users/erik/Documents/ApacheFlex/git/flex-sdk4.14.1/frameworks/projects/framework/src/mx/styles/StyleProtoChain.as:929]
at mx.styles::StyleProtoChain$/getClassStyleDeclarations()[/Users/erik/Documents/ApacheFlex/git/flex-sdk4.14.1/frameworks/projects/framework/src/mx/styles/StyleProtoChain.as:122]
at mx.core::UIComponent/getClassStyleDeclarations()[/Users/erik/Documents/ApacheFlex/git/flex-sdk4.14.1/frameworks/projects/framework/src/mx/core/UIComponent.as:11479]
at mx.styles::StyleProtoChain$/getMatchingStyleDeclarations()[/Users/erik/Documents/ApacheFlex/git/flex-sdk4.14.1/frameworks/projects/framework/src/mx/styles/StyleProtoChain.as:831]
at mx.styles::StyleProtoChain$/initProtoChain()[/Users/erik/Documents/ApacheFlex/git/flex-sdk4.14.1/frameworks/projects/framework/src/mx/styles/StyleProtoChain.as:252]
at mx.core::UIComponent/http://www.adobe.com/2006/flex/mx/internal::initProtoChain()[/Users/erik/Documents/ApacheFlex/git/flex-sdk4.14.1/frameworks/projects/framework/src/mx/core/UIComponent.as:11458]
at mx.core::UIComponent/regenerateStyleCache()[/Users/erik/Documents/ApacheFlex/git/flex-sdk4.14.1/frameworks/projects/framework/src/mx/core/UIComponent.as:11521]
at spark.components::Group/regenerateStyleCache()[/Users/erik/Documents/ApacheFlex/git/flex-sdk4.14.1/frameworks/projects/spark/src/spark/components/Group.as:1300]
at mx.core::UIComponent/regenerateStyleCache()[/Users/erik/Documents/ApacheFlex/git/flex-sdk4.14.1/frameworks/projects/framework/src/mx/core/UIComponent.as:11542]
at mx.core::UIComponent/regenerateStyleCache()[/Users/erik/Documents/ApacheFlex/git/flex-sdk4.14.1/frameworks/projects/framework/src/mx/core/UIComponent.as:11542]
at mx.core::UIComponent/set styleName()[/Users/erik/Documents/ApacheFlex/git/flex-sdk4.14.1/frameworks/projects/framework/src/mx/core/UIComponent.as:6764]
at spark.components::ActionBar/styleChanged()[/Users/erik/Documents/ApacheFlex/git/flex-sdk4.14.1/frameworks/projects/mobilecomponents/src/spark/components/ActionBar.as:911]
at mx.core::UIComponent/set styleName()[/Users/erik/Documents/ApacheFlex/git/flex-sdk4.14.1/frameworks/projects/framework/src/mx/core/UIComponent.as:6768]

//Example code:
LogInView (View with login form);
[Bindable] public var transition1:CrossFadeViewTransition = new CrossFadeViewTransition();

protected function logIn_clickHandler(event:MouseEvent):void {
popupView.popView();
popupView.pushView(LogInView);
splitNavigator.showFirstViewNavigatorInPopUp(buttonLogIn);
}

protected function popupView_hideHandler(event:FlexEvent):void
{
popupView.popAll();
}

<s:SplitViewNavigator id="splitNavigator"
width="0" height="0">
<s:ViewNavigator id="popupView" width="

{Utils.getPixels(320)}

" height="

{Utils.getPixels(400)}

" visible="false"
defaultPopTransition="

{transition1}" defaultPushTransition="{transition1}

" hide="popupView_hideHandler(event)">
</s:ViewNavigator>
</s:SplitViewNavigator>
............
<s:actionContent>
<s:HGroup gap="0">
<s:Image buttonMode="true" id="buttonLogIn" click="logIn_clickHandler(event);"
visible="

{!model.meetingId}" includeInLayout="{!model.meetingId}

" source="

{AssetsManager.images.login}

" />
</s:HGroup>
</s:actionContent>

.............