InvalidCharacterError: Failed to execute 'atob' on 'Window': The string to be decoded is not correctly encoded.

[Roaders]

Description

Occasionally when a window has been closed the following error is observed:

url-helper.js:33 Uncaught (in promise) InvalidCharacterError: Failed to execute 'atob' on 'Window': The string to be decoded is not correctly encoded.
    at decodeUUUrl (url-helper.js:33:1)
    at DesktopAgentImpl.cleanupIntentListenerCallbacks (desktop-agent.js:624:29)
    at DesktopAgentImpl.handleProxyDisconnect (desktop-agent.js:564:1)
    at DesktopAgentImpl.sendHeartbeat (desktop-agent.js:526:1)
    at desktop-agent.js:512:1

The issue appears to be within cleanupIntentListenerCallbacks in DesktopAgentImpl where it assumes that a key in the intentListenerCallbacks can be decoded.

Area of Issue

• App Directory
• Broadcasts
• Intents
• App / Channel Resolver
• Cross Frame / Window Messaging
• Other