Title: Block Validation Error – Plugin is broken
Last modified: September 16, 2019

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# Block Validation Error – Plugin is broken

 *  [namwen](https://wordpress.org/support/users/namwen/)
 * (@namwen)
 * [6 years, 8 months ago](https://wordpress.org/support/topic/block-validation-error-plugin-is-broken/)
 * Hi,
 * In using this plugin on WordPress 6.1.8, the “Flip Box” block breaks upon being
   saved. The javascript console throws out an error message saying ‘Block validation:
   Block validation failed for `fest-ultra-addons-gutenberg/flip-box`‘.
 * I was able to determine that the cause is the Button component’s target being
   set to “_blank”. For security reasons, WP adds a rel=”noopener noreferrer” attribute
   to all anchor tags which open in a new window. Your block definition does not
   have a rel tag in as part of its attributes and thus it fails validation, which
   blocks the user from editing the block after saving.
 * Adding the rel attribute and re-building the components should do the trick!

The topic ‘Block Validation Error – Plugin is broken’ is closed to new replies.

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 * 0 replies
 * 1 participant
 * Last reply from: [namwen](https://wordpress.org/support/users/namwen/)
 * Last activity: [6 years, 8 months ago](https://wordpress.org/support/topic/block-validation-error-plugin-is-broken/)
 * Status: not resolved