Thanks Emanulele, looking the log errors I find a lot of this kind of errors
// The only special case is 'html', which doesn't need to close things.
285:
if ($tag[Codes::ATTR_BLOCK_LEVEL] && $tag[Codes::ATTR_TAG] !== 'html' && !$this->inside_tag[Codes::ATTR_BLOCK_LEVEL])
286:
{
287:
$this->closeNonBlockLevel();
Actually I'm using php 7.4.13
This version has been automatically set by my provider "One" ...
When elkarte was insalled in 2018 I did the choice of php version 7.2 .
Now I changed from 7.4 to 7.3 lets see if it can be of any differenze