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Hello!
 

After merging some docx files, I am trying to transform the document to HTML format, but I am getting this error: 

Call to undefined method DOMText::getElementsByTagNameNS()

file: phpdocx/Classes/Phpdocx/Transform/TransformDocAdvHTML.php:2529

The merge function is as follows: 

$docxMerger = new Phpdocx\Utilities\MultiMerge();

$result = $docxMerger->mergeDocx($firstDocument, $docArray, $destination, ['mergeType'=> 1,'preserveStyleDefaults' => true, 'enforceSectionPageBreak' => true, 'numbering' => 'continue']);

The transform function is the same as your example.

The issue dissapears if I open the file with MSWord and save it again.
 

Thank you