Version Pages Appearing in the Page Tree

Problem

If there is no home page defined in a space where Scroll Versions is activated, users might see change pages (dot-pages) in the page tree, in addition to Scroll Versions toolbar not being visible and an exception appearing in the logs:

CODE

java.lang.NullPointerException
	at com.k15t.scroll.platform.ui.theme.ScrollPageBreadcrumb.resolveHomePage(ScrollPageBreadcrumb.java:89)
	at com.k15t.scroll.platform.ui.theme.ScrollPageBreadcrumb.getScrollSpaceBreadcrumb(ScrollPageBreadcrumb.java:79)
	at com.k15t.scroll.platform.ui.theme.ScrollPageBreadcrumb.getParent(ScrollPageBreadcrumb.java:53)
	at com.atlassian.confluence.util.breadcrumbs.AbstractBreadcrumb.getBreadcrumbsTrail(AbstractBreadcrumb.java:73)
	at com.k15t.scroll.platform.ui.theme.ScrollPageBreadcrumb.getBreadcrumbsTrail(ScrollPageBreadcrumb.java:62)
	at com.k15t.scroll.platform.services.context.impl.DefaultScrollVersionsContextProvider.getBreadcrumbs(DefaultScrollVersionsContextProvider.java:198)
	at com.k15t.scroll.platform.services.context.impl.DefaultScrollVersionsContextProvider.getScrollVersionsContextForPage(DefaultScrollVersionsContextProvider.java:139)
	at com.k15t.scroll.platform.services.context.impl.DefaultScrollVersionsContextProvider.getScrollVersionsContext(DefaultScrollVersionsContextProvider.java:108)
	at com.k15t.scroll.platform.ui.page.context.ScrollPageContextRenderer.getHtml(ScrollPageContextRenderer.java:71)

Environment

Scroll Versions
All versions

Resolution

Run Health Check in Space Tools → Scroll Add-ons → Health Check

or

Go to the space and choose Space tools > Overview from the bottom of the sidebar.
Choose Edit Space Details.
Enter the page you want use in the Home page field then choose Save.

Cause

Due to the absence of a home page certain features such as page hiding change pages in the tree and the app's toolbar may not work as expected.