Plugin breaks other plugin

Hello, I’m using this plugin but found it breaks at least Woocommerce German Market PDF invoices which uses HTML to generate the PDF. The problem is in file email-trigger.php because fix_default_thumbnail does not reset after use and in my case it inserts the tags even when it should not and therefore creating invalid HTML.

Could you change the function item_thumnail_end() to this:

	public function item_thumbnail_end() {
		if ( $this->fix_default_thumbnail ) {
			?>
			</td>
			</tr>
			</table>
			<?php
                        $this->fix_default_thumbnail = false;
		}
	}

?

Thanks in advance