Version of script: 2.7.3
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Installed Hesk on my local server for customisation and testing, before installing it on a clients server. Mods for Hesk v 3.0.7 is installed as well. All is working fine, on the clients side, tickets can be opened, closed, replies added etc.
When opening a received ticket as admin I am getting a blank screen.
Debugger info:

I can't post the code here for whatever reasons, thus the image.
Any help is appreciated, thank you!