[Solved] Lovelace dashboard empty after upgrade to HA 0.106 due to group-card errors

@inutilis wrote:

Lovelace dashboard is completely empty after upgrade to Home Assistant 0.106.0. Log files contain group-card related errors that probably cause the issue:

2020-02-26 20:08:06 ERROR (MainThread) [frontend.js.latest.202002204] http://192.168.0.2:8123/local/community/group-card/group-card.js:22:28 Uncaught TypeError: Cannot add property entities, object is not extensible
2020-02-26 20:08:06 ERROR (MainThread) [frontend.js.latest.202002204] http://192.168.0.2:8123/local/community/group-card/group-card.js:22:28 Uncaught TypeError: Cannot add property entities, object is not extensible
2020-02-26 20:08:06 ERROR (MainThread) [frontend.js.latest.202002204] http://192.168.0.2:8123/local/community/group-card/group-card.js:22:28 Uncaught TypeError: Cannot add property entities, object is not extensible

I have several similar cards in ui-lovelace.yaml

          - type: custom:group-card
            card:
              type: entities
              title: Kids lights
              show_header_toggle: true
              state_color: true
            group: group.kids_room

Group-card has no newer version in HACS and nothing related in HA release notes also mentioned.
Any idea what has changed and how to fix lovelace dashboard?

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