Call to a member function count() on null

[fbatschi]

Bug description After updating our TYPO3 installation to the latest 11.5.29 version and while using rte_ckeditor_image 11.0.11 I get the error

Error
Call to a member function count() on null
in /var/www/typo3/public/typo3conf/ext/rte_ckeditor_image/Classes/Backend/Preview/RteImagePreviewRenderer.php line 129

regardless of which page i try to edit.

The line is this

https://github.com/netresearch/t3x-rte_ckeditor_image/blob/f78ae0e95be2a30e3d03fbc7db7449c2a443b0ea/Classes/Backend/Preview/RteImagePreviewRenderer.php#L129

Expected behavior

No error is thrown.

Possible Fix

Chaging the line to

if (isset($node->childNodes) && $node->childNodes->count() > 0) {

fixes this.

Environment

• TYPO3 version: 11.5.29
• PHP version: 7.4
• Extension version: 11.0.11

Documentation Have you checked the readme/documentation?

• [X] Yes, but I couldn't find anything helpful

[olegkarun]

Same problem for me TYPO3 version: 11.5.28 PHP version: 7.4.3 Extension version: 11.0.11

[kkugelmann]

Same problem in one of our clients instances: TYPO3 version: 11.5.30 PHP Version: 7.4.3 Extension versions: 11.0.11

[npoggenburg]

Can confirm: TYPO3 version: 11.5.30 PHP Version: 7.4.3 Extension versions: 11.0.11

I can confirm the solution from the topic author too.