Internal Script Error! - opcode #0 (report please)

[Speedphoenix]

Error message in terminal:

ERROR: call: Condition ' op >= Variant::OP_MAX ' is true. Breaking..:
   At: modules/gdscript/gdscript_function.cpp:451.

Godot version:

Godot Engine v3.2.2.stable.official - https://godotengine.org

OS/device including version:

OpenGL ES 3.0 Renderer: Mesa Intel(R) HD Graphics 520 (SKL GT2)

Issue description:

The game froze less than a minute after launching it from the editor and the debugger had the message
Internal Script Error! - opcode #0 (report please)

Steps to reproduce:
Unsure

Minimal reproduction project:

I was not able to reproduce this issue.
Note that my project has a lot of some randomness to it. I do not have the seeds, but if it helps, the issue occurred a few minutes before 2021-01-16T02:57:00+0000

0 - res://scripts/events/DecisionSimple.gd:24 - at function: on_refused
1 - res://scripts/events/TurnController.gd:75 - at function: trigger_next_turn
2 - res://scripts/events/TurnController.gd:66 - at function: on_turn_timeout

The method on_turn_timeout was called from a timer's timeout signal
The method trigger_next_turn emits a turn_changed signal
The editor pointed the stack trace 0 to the yield statement on this signal

func _apply_refuse_expire():
	yield(turn_controller, "turn_changed")
	gauge_controller.apply_to_gauges(refuse_or_expire_effects.on_gauges)

func on_refused(scene_tree: SceneTree) -> void:
	_apply_refuse_expire()

This issue happened on this project, on commit c4aea98, when running the scene res://dummytests/TestScene.tscn from the editor (using F6).

I have created the branch godot-issue-2 (at 6bc0cf9) where I removed every resource that has no relation to TestScene.tscn, but as I could not reproduce this to begin with, I did not remove any of the components that are remotely related.

The zip attachment is this project at commit 6bc0cf9 where I cleaned what is certainly unrelated
internal script error project.zip

[Demindiro]

See #42379

[Calinou]

Duplicate of #42379 (same cause). Feel free to comment there with the minimal reproduction project.