DoS Captcha Preview Not showing

Hello All,

I am seeing an issue trying to preview the DoS Captcha. When I press show, a blank pop-up appears.

In the dev tools I can see the following error in the console:

dos_profile_properties.php?mode=edit&profile=/Common/_ddos_policy:1332 Uncaught TypeError: Cannot read properties of undefined (reading 'contentDocument') at show_captcha_response (dos_profile_properties.php?mode=edit&profile=/Common/_ddos_policy:1332:59) at HTMLInputElement.onclick (dos_profile_properties.php?mode=edit&profile=/Common/_ddos_policy:1720:132) dos_profile_properties.php?mode=edit&profile=/Common/_ddos_policy:1332 Uncaught TypeError: Cannot read properties of undefined (reading 'contentDocument') at show_captcha_response (dos_profile_properties.php?mode=edit&profile=/Common/_ddos_policy:1332:59) at HTMLInputElement.onclick (dos_profile_properties.php?mode=edit&profile=/Common/_ddos_policy:1720:132)

Has anyone seen this issue before or know how to resolve?

We are running asm version 17.5.1.3