DOMElement::setIdAttribute(): ID loading already defined

Start at Parser/DOMTreeBuilder.php line 392 and follow the reported parse path through HTML5.php and Tokenizer.php. The input is not provided, so first isolate an HTML document that triggers the duplicate ID warning; done means the warning no longer occurs for that reproducer.

Hello,

Sometimes i get strange error:

PHP Warning:  DOMElement::setIdAttribute(): ID loading already defined in /home/xxx/domains/xxx/public_html/xxx/core/framework/Masterminds/HTML5/Parser/DOMTreeBuilder.php on line 392
PHP Stack trace:
PHP   1. {main}() /home/xxx/domains/xxx/public_html/index.php:0
PHP   2. Core\xxx->loadPage() /home/xxx/domains/xxx/public_html/index.php:147
PHP   3. Modules\xxx\Main->load() /home/xxx/domains/xxx/public_html/xxx/core/xxx.php:619
PHP   4. Modules\xxx\Main->_startEngine() /home/xxx/domains/xxx/public_html/xxx/modules/xxx/main.php:301
PHP   5. Modules\xxx\Main->_runCrawler() /home/xxx/domains/xxx/public_html/xxx/modules/xxx/main.php:121
PHP   6. Core\Classes\Search\Crawler->visitPage() /home/xxx/domains/xxx/public_html/xxx/modules/xxx/main.php:154
PHP   7. Masterminds\HTML5->loadHTML() /home/xxx/domains/xxx/public_html/xxx/core/classes/search/crawler.php:28
PHP   8. Masterminds\HTML5->parse() /home/xxx/domains/xxx/public_html/xxx/core/framework/Masterminds/HTML5.php:94
PHP   9. Masterminds\HTML5\Parser\Tokenizer->parse() /home/xxx/domains/xxx/public_html/xxx/core/framework/Masterminds/HTML5.php:165
PHP  10. Masterminds\HTML5\Parser\Tokenizer->consumeData() /home/xxx/domains/xxx/public_html/xxx/core/framework/Masterminds/HTML5/Parser/Tokenizer.php:83
PHP  11. Masterminds\HTML5\Parser\Tokenizer->tagOpen() /home/xxx/domains/xxx/public_html/xxx/core/framework/Masterminds/HTML5/Parser/Tokenizer.php:126
PHP  12. Masterminds\HTML5\Parser\Tokenizer->tagName() /home/xxx/domains/xxx/public_html/xxx/core/framework/Masterminds/HTML5/Parser/Tokenizer.php:269
PHP  13. Masterminds\HTML5\Parser\DOMTreeBuilder->startTag() /home/xxx/domains/xxx/public_html/xxx/core/framework/Masterminds/HTML5/Parser/Tokenizer.php:371
PHP  14. DOMElement->setIdAttribute() /home/xxx/domains/xxx/public_html/xxx/core/framework/Masterminds/HTML5/Parser/DOMTreeBuilder.php:392
PHP Warning:  DOMElement::setIdAttribute(): ID placeholder already defined in /home/xxx/domains/xxx/public_html/xxx/core/framework/Masterminds/HTML5/Parser/DOMTreeBuilder.php on line 392

I don't know what the input is, but i hope you can help me?