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Hello,

Please apply this diff to check if the issue is solved:

3185,3188c3185,3190

<                    $default = '<Default Extension="' . $extension . '" ContentType="image/' . $extension . '" />';

<                    $ctFragment = $this->_watermarkDocxContentTypesDOM->createDocumentFragment();

<                    $ctFragment->appendXML($default);

<                    $this->_watermarkDocxContentTypesDOM->documentElement->appendChild($ctFragment);

---

>                    if(strpos($this->_watermarkDocxContentTypesXML, 'Extension="' . $extension . '"' ) === false){

>                         $default = '<Default Extension="' . $extension . '" ContentType="image/' . $extension . '" />';

>                         $ctFragment = $this->_watermarkDocxContentTypesDOM->createDocumentFragment();

>                         $ctFragment->appendXML($default);

>                         $this->_watermarkDocxContentTypesDOM->documentElement->appendChild($ctFragment);

>                    }

Regards.