Space Admin export of pages to PDF containing Lucid charts gives error

Steps to reproduce

1. Go to a space that contains pages with Lucid Charts
2. Go to Browse > Space Operations
3. Click on Export - PDF
4. Select the Custom Export radio button
5. Check one or more pages which contains Lucid Charts
6. Click on Export button
7. Download the PDF

Issue

Instead of having the chart, each of them are replaced by:

Error: Unable to retrieve macro content from Remotable Plugin 'Lucidchart': The validated object is null

See attached file as the result.

P.S.: If you export a single page through its 'Tools > Export to PDF', it works fine.