const pdf = new jsPDF('l', 'px', 'a4');
pdf.internal.scaleFactor = 0.75;
const logo = html2canvas(document.getElementById('activityLogo'))
pdf.addImage(logo, 'jpeg');
pdf.save(`file.pdf`);

<ng-template #exportImage>
    <div class="pt-2 pb-5">
        <img alt="Information" id="activityLogo" src="assets/img/brand/png/Logo.png" width="100" />
    </div>
</ng-template>

Cannot read property 'ownerDocument' of null