TYPO3 Exception 1446996319¶

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Configuration retrieved from FlexForm is incomplete or not of type "inline"¶

#1446996319: Configuration retrieved from FlexForm is incomplete or not of type "inline"
UnexpectedValueException thrown in file
/../typo3/sysext/backend/Classes/Controller/FormInlineAjaxController.php in line 935.

Happens when attaching an image to a new non-saved Fluid content element.

Also:

UnexpectedValueException thrown in file
/.../typo3/sysext/backend/Classes/Controller/FormInlineAjaxController.php in line 909.

TYPO3 v7.6.32 Happens when attaching an image to an existing content element.