We are facing an issue in Unreal Engine 5.5.4 where clicking the "Login" button in the built-in Quixel Bridge plugin causes the editor to crash with an assertion failure

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We are facing an issue in Unreal Engine 5.5.4 where clicking the “Login” button in the built-in Quixel Bridge plugin causes the editor to crash with an assertion failure. The error message points to a problem in the FabAuthentication module, specifically at line 305 of FabAuthentication.cpp. The crash log indicates an invalid smart pointer (TSharedPtr) when attempting to log in via the account portal.

Steps to reproduce:

  1. Launch Unreal Engine 5.5.4.

  2. Open the Quixel Bridge panel (usually via Window > Quixel Megascans).

  3. Click the “Login” button.

  4. The editor crashes immediately with an assertion failure.