Unable to reload Preview panel in non-development build

[filippsen]

Environment/Browser

Version 1.5.0 (lab-beta only or equivalent build, not development)

Description

Uncaught exception when clicking the Reload button in Preview panel.

Steps to reproduce

1. From Hello World template
2. Open HelloWorld.sol
3. Open Preview panel
4. Click Deploy
5. Click the Reload button in Preview panel

Expected result

Expected the content area to reload.

Actual result

Chrome:

Uncaught DOMException: Blocked a frame with origin "https://lab-beta.superblocks.com" from accessing a cross-origin frame.

Firefox:

SecurityError: Permission denied to access property "reload" on cross-origin object