Null Pointer when create iView

Hello, I've found weird behavior of NW 7.3 portal

When I'm trying to create iView from template I got exception

12:29_28/05/13_0005_2246550 [EXCEPTION] java.lang.NullPointerException: while trying to invoke the method java.lang.String.trim() of an object returned from com.sapportals.htmlb.TextEdit.getText() at com.sapportals.admin.wizardframework.components.MultilineInputComponent.processInput(MultilineInputComponent.java:221) at ........

Doesn't mater which kind of template was selected, in my case it was URL iView, but other templates got same result

What I found: iView registration form has field "Description", but there is no input field itself. From the stack trace seems that's the reason: application try to trim spaces of null object

I can call default chromium context menu by the right mouse button and there is no edit text html element in DOM model

But! Creating of "Page" elements going well, description field parent, right button menu is sap menu and form background is blue(instead of white for iView form)

what could be reason of such exception? I'm just getting started to play with portal and so trivial stuff looks broken

Thanks