Blank pdf file downloaded from VBCS

Hello,

We have custom VBCS page which displays data in a table. When user clicks on Export to PDF Button, the file should be downloaded as PDF. However, the file that is downloaded just contains headers of the table. The table data is missing from the file. This functionality was working fine previously, however, we recently noticed that this not working right now, even though no changes were made to the code.

Please see below code for reference: