viewer.setPanorama shows black in case of cube panorama

[noorfatma]

Description

Describe the bug or issues with as much detail as possible. It'd be nice to have a code snippet or screenshots to better illustrate the problems.

Please also include a live example if possible. You can start from these templates:

• codepen (dev branch)

Panolens version

• Master
• Dev

Browser

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• Chrome
• Firefox
• Internet Explorer

OS

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• Windows
• macOS
• Linux
• Android
• iOS

Hardware Requirements (graphics card, VR Device, ...)

I have a panorama added to the viewer. Now after some time I try to switch to new panorama. I am able to switch to image panorama but i get a black screen if it is a cube panorama.
What could be the problem