"Export as PDF" Export Availability Timeline of Hosts fails

CMK version: 1.6.0p27
OS version: CentOS Linux release 7.9.2009

Error message: “Export as PDF” Export Availability Timeline of Hosts fails

  1. Service problems
    Error while rendering element type ‘A Multisite view’
    Traceback (most recent call last):
    File “/omd/sites/dws_mon/lib/python/cmk/gui/cee/reporting.py”, line 2937, in render_report_element
    element_type.render(element, instance)
    File “/omd/sites/dws_mon/lib/python/cmk/gui/cee/plugins/reporting/views.py”, line 363, in render
    views.show_view(view, view_renderer, only_count=False)
    File “/omd/sites/dws_mon/lib/python/cmk/gui/views.py”, line 1334, in show_view
    view, context, filterheaders)
    File “/omd/sites/dws_mon/lib/python/cmk/gui/plugins/views/availability.py”, line 213, in render_availability_page
    title += view_title(view.spec)
    File “/omd/sites/dws_mon/lib/python/cmk/gui/plugins/views/utils.py”, line 1041, in view_title
    return visuals.visual_title(‘view’, view)
    File “/omd/sites/dws_mon/lib/python/cmk/gui/visuals.py”, line 1404, in visual_title
    title = _u(visual[“title”])
    KeyError: 'title