.. include:: /Includes.rst.txt ========================== TYPO3 Exception 1581862822 ========================== .. include:: /If-you-encounter-this-exception.rst.txt This error might be caused by inserting content into a Fluid template by .. code-block::xml If the TypoScript object uses a :typoscript:`insertData = 1` or the datawrap curly braces might get parsed, see https://docs.typo3.org/m/typo3/reference-typoscript/main/en-us/Functions/Stdwrap.html?highlight=insertdata. So, the serialized value of the hidden form field :php:`tx_form_formframework[__trustedProperties]` get's parsed, too. The following HMAC validation throws the exception, because the :php:`__trustedProperties` is broken.