I cannot create a subject

Netlify CMS
1

I get this error when i try to create a topic. What is the cause?

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2

Hi @RawShed and welcome :slight_smile: A
Are you using a custom preview template? If so can you share the template code, the way you’re registering it and your config.yml?
Looks like you’re passing a null value in your custom code.
Sharing the repo will also be of great help if you can.

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@erez Github repo: https://github.com/fuatcangenc/gatsby-deneme

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Hi @RawShed, it looks like the image can be null here:
https://github.com/fuatcangenc/gatsby-deneme/blob/b999dfaf4aad4ea78db7a7e1c74263801f674e3d/src/components/SEO/index.jsx#L26
Some posts don’t have the cover property.