Steps to reproduce:

1. Go to Admin / Content Types.
2. Add new content group e.g. 'Images'.
3. Within content group 'Images' create a new 'Content Type' with defined fields 'content query' and 'author'.
4. After that go to Content / Content structure and add new 'Landing page'.
5. On 'creating new landing page' view add block 'Content List'.
6. Click on 'settings' button in this block and then 'select content' button.
7. Switch tab to 'Create' and select your 'content type' from the list and then click on 'create content' button.
8. After publishing created landing page try to request for this content through rest API client with provided content id, version and identifier of content query.

Actual result:

After requesting for a content 'Landing page' user receives status code 500.

Expected result:

User should receive correct status code e.g. 406 with correct response message