Updating failed. The response is not a valid JSON response.

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I’m really sorry to let you know that when your plugin is active on my WordPress self-hosted installation, I get this message:

Updating failed. The response is not a valid JSON response.

I have tried even deactivating all plugins, and issue persists. If I deactivate only “External links”, I am capable again to edit pages, posts and custom post types.

Thank you.

 

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