Changing type of Homepage-node causes Footer to throw an exception

Sounds like you have a broken node data table. It cannot find the node with the path /sites, although there should be a check to prevent the fatal error. You should have at least two nodes in your node data table like these:

INSERT INTO `typo3_typo3cr_domain_model_nodedata` (`persistence_object_identifier`, `workspace`, `contentobjectproxy`, `path`, `identifier`, `sortingindex`, `properties`, `nodetype`, `removed`, `hidden`, `hiddenbeforedatetime`, `hiddenafterdatetime`, `hiddeninindex`, `accessroles`, `version`, `parentpath`, `pathhash`, `dimensionshash`, `dimensionvalues`, `parentpathhash`, `movedto`, `creationdatetime`, `lastmodificationdatetime`, `lastpublicationdatetime`)
  VALUES
('fa995938-16aa-11ba-c696-d77a8ae3f845', 'live', NULL, '/', '352af71b-e17f-b063-1215-b1bdf035961c', NULL, '{}', 'unstructured', 0, 0, NULL, NULL, 0, '[]', 2, '', '6666cd76f96956469e7be39d750cc7d9', 'd751713988987e9331980363e24189ce', '[]', 'd41d8cd98f00b204e9800998ecf8427e', NULL, '2015-07-31 19:36:07', '2015-07-31 19:36:07', NULL),
('af6e8d6a-ca43-7ee4-f655-fbf2cd85b198', 'live', NULL, '/sites', '5df2948d-435f-01ed-4626-043608e2265e', 100, '{}', 'unstructured', 0, 0, NULL, NULL, 0, '[]', 1, '/', 'dbd87ae51cbf5240fea77283585e69d5', '4f534b1eb0c1a785da31e681fb5e91ff', '{\n    \"language\": {\n        \"0\": \"en_US\"\n    }\n}', '6666cd76f96956469e7be39d750cc7d9', NULL, '2015-07-31 19:36:07', '2015-07-31 19:36:07', NULL);

Might be a bit different depending if you’re using content dimensions or not.

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