"Parameter "script_lang" is null" error when pausing a scene that uses no scripts

[JekSun97]

Tested versions

4.3 stable, 4.4 beta 2

System information

Godot v4.4.beta2 - Windows 10 (build 19045) - Multi-window, 1 monitor - Vulkan (Forward+) - dedicated Radeon RX 560 Series (Advanced Micro Devices, Inc.; 31.0.21912.14) - Intel(R) Core(TM) i5-4570 CPU @ 3.20GHz (4 threads)

Issue description

I see an error when we pause the game (pause in the upper right corner), which is strange, it only happens in 3D scenes, when launching 2D scenes it does not.

0130.mp4

Steps to reproduce

1. Create a 3D scene
2. Run it
3. Press the pause button in the upper right corner
4. Error - debug: Parameter "script_lang" is null. <Source code C++>core/debugger/remote_debugger.cpp:420 @ debug()

Minimal reproduction project (MRP)

N/A

[akien-mga]

Actually I can reproduce the issue, I was testing it wrong.

It happens when pausing with the pause button in the run bar / top right corner, and not with the pause button in the embedded game viewport.

It happens with both 2D and 3D scenes (or plain Node, that's not the factor), whenever no node in the scene has a script. Hence the script related error.

It's reproducible in 4.4-beta2, 4.3-stable and 4.2-stable (didn't test earlier), so it's not a recently introduced bug.

The problem is in RemoteDebugger::debug which assumed that any paused scene must have an active script language, so it can trigger script debugging logic. This needs to be refactored a bit to gracefully handle pausing when no script exists. I'm not sure whether it means no debugger should be started at all, or if we can still have debuggers/profilers active without the script part.