Created attachment 1308727 [details]
ui_error

Description of problem:
After login into admin portal UI error appears 
Exception caught: (TypeError) : plu(...).contentWindow.document.body is null 
It's only the first time after engine is restarted.

Version-Release number of selected component (if applicable):
ovirt-engine-webadmin-portal-4.2.0-0.0.master.20170802210223.git338a2bc.el7.centos.noarch

How reproducible: 3/5, it should be exactly after restart


Steps to Reproduce:
1. restart service ovirt-engine
2. go fast to www, reload until welcome page is shown and log into admin portal

Actual results: ui error appears, see attachment


Expected results: no ui error


Additional info:
ui.log

2017-08-03 14:08:52,188+02 ERROR [org.ovirt.engine.ui.frontend.server.gwt.OvirtRemoteLoggingService] (default task-4) [] Permutation name: 10CB56F98F589168F3AA29C23C6C897D
2017-08-03 14:08:52,189+02 ERROR [org.ovirt.engine.ui.frontend.server.gwt.OvirtRemoteLoggingService] (default task-4) [] Uncaught exception: com.google.gwt.event.shared.UmbrellaException: Exception caught: (TypeError) : plu(...).contentWindow.document.body is null
        at java.lang.Throwable.Throwable(Throwable.java:70) [rt.jar:1.8.0_141]
        at java.lang.RuntimeException.RuntimeException(RuntimeException.java:32) [rt.jar:1.8.0_141]
        at com.google.web.bindery.event.shared.UmbrellaException.UmbrellaException(UmbrellaException.java:64) [gwt-servlet.jar:]
        at com.google.gwt.event.shared.UmbrellaException.UmbrellaException(UmbrellaException.java:25) [gwt-servlet.jar:]
        at com.google.gwt.event.shared.HandlerManager.$fireEvent(HandlerManager.java:117) [gwt-servlet.jar:]
        at com.google.gwt.event.logical.shared.ResizeEvent.fire(ResizeEvent.java:40) [gwt-servlet.jar:]
        at com.google.gwt.user.client.Window.onResize(Window.java:862) [gwt-servlet.jar:]
        at Unknown.onresize<(https://host1.obfuscateddomain0.com/ovirt-engine/webadmin/?locale=en_US)
        at com.google.gwt.core.client.impl.Impl.apply(Impl.java:236) [gwt-servlet.jar:]
        at com.google.gwt.core.client.impl.Impl.entry0(Impl.java:275) [gwt-servlet.jar:]
        at Unknown.Ku/<(https://host1.obfuscateddomain0.com/ovirt-engine/webadmin/?locale=en_US)
        at Unknown.trigger(https://host1.obfuscateddomain0.com/ovirt-engine/webadmin/theme/00-ovirt.brand/ovirt-js-dependencies/jquery/dist/jquery.min.js)
        at Unknown.trigger/<(https://host1.obfuscateddomain0.com/ovirt-engine/webadmin/theme/00-ovirt.brand/ovirt-js-dependencies/jquery/dist/jquery.min.js)
        at Unknown.each(https://host1.obfuscateddomain0.com/ovirt-engine/webadmin/theme/00-ovirt.brand/ovirt-js-dependencies/jquery/dist/jquery.min.js)
        at Unknown.each(https://host1.obfuscateddomain0.com/ovirt-engine/webadmin/theme/00-ovirt.brand/ovirt-js-dependencies/jquery/dist/jquery.min.js)
        at Unknown.trigger(https://host1.obfuscateddomain0.com/ovirt-engine/webadmin/theme/00-ovirt.brand/ovirt-js-dependencies/jquery/dist/jquery.min.js)
        at Unknown.forceResize/<(https://host1.obfuscateddomain0.com/ovirt-engine/webadmin/theme/00-ovirt.brand/patternfly-3.25.1-custom.min.js)
        at Unknown.anonymous(Unknown)
Caused by: com.google.gwt.core.client.JavaScriptException: (TypeError) : plu(...).contentWindow.document.body is null
        at org.ovirt.engine.ui.webadmin.section.main.view.DynamicUrlContentTabView.$lambda$1(DynamicUrlContentTabView.java:29)
        at org.ovirt.engine.ui.webadmin.section.main.view.DynamicUrlContentTabView$lambda$1$Type.onResize(DynamicUrlContentTabView.java:29)
        at com.google.gwt.event.logical.shared.ResizeEvent.dispatch(ResizeEvent.java:104) [gwt-servlet.jar:]
        at com.google.gwt.event.shared.GwtEvent.dispatch(GwtEvent.java:76) [gwt-servlet.jar:]
        at com.google.web.bindery.event.shared.SimpleEventBus.$doFire(SimpleEventBus.java:173) [gwt-servlet.jar:]
        ... 14 more