It seems like Timeline indicator is not displaying in a Showcase page

[taurus]

There are no indicator in https://www.smartclient.com/smartgwt/showcase/#timeline_zones_and_indicators


Browser console output is:

ISC_Core.js?isc_version=12.0p_2020-03-25.js:303 Uncaught TypeError: Cannot read property 'getTime' of undefined
at _3.isc_Calendar_canEditEvent [as canEditEvent] (ISC_Calendar.js?isc_version=12.0p_2020-03-25.js:491)
at _3.isc_EventCanvas_shouldShowGripper [as shouldShowGripper] (ISC_Calendar.js?isc_version=12.0p_2020-03-25.js:688)
at _3.isc_EventCanvas_initWidget [as initWidget] (ISC_Calendar.js?isc_version=12.0p_2020-03-25.js:687)
at _3.isc_c_Class_invokeSuper [as invokeSuper] (ISC_Core.js?isc_version=12.0p_2020-03-25.js:294)
at _3.isc_c_Class_Super [as Super] (ISC_Core.js?isc_version=12.0p_2020-03-25.js:286)
at _3.isc_IndicatorCanvas_initWidget [as initWidget] (ISC_Calendar.js?isc_version=12.0p_2020-03-25.js:731)
at _3.isc_Canvas_init [as init] (ISC_Core.js?isc_version=12.0p_2020-03-25.js:2576)
at _3.isc_Class_createAutoChild [as createAutoChild] (ISC_Core.js?isc_version=12.0p_2020-03-25.js:391)
at _3.isc_Calendar_getIndicatorCanvas [as getIndicatorCanvas] (ISC_Calendar.js?isc_version=12.0p_2020-03-25.js:544)
at _3.isc_CalendarView_drawIndicators [as drawIndicators] (ISC_Calendar.js?isc_version=12.0p_2020-03-25.js:206)
at _3.isc_CalendarView_refreshVisibleEvents [as refreshVisibleEvents] (ISC_Calendar.js?isc_version=12.0p_2020-03-25.js:180)
at ISC_Calendar.js?isc_version=12.0p_2020-03-25.js:96
at _3.isc_c_Class_fireCallback [as fireCallback] (ISC_Core.js?isc_version=12.0p_2020-03-25.js:303)
at _3.isc_c_Timer__fireTimeout [as $in] (ISC_Core.js?isc_version=12.0p_2020-03-25.js:1808)
at ISC_Core.js?isc_version=12.0p_2020-03-25.js:1805

SmartGWT version: 12.0p 2020-03-25 (according to Swowcase page information)