### Godot version

4.0.dev (c309de53997feff3286295fb2d71657f112a15db)

### System information

Linux, Nvidia, Vulkan

### Issue description

Editor segfaults when certain conditions are met when using the AnimationPlayer editor.

### Steps to reproduce

1. Create multiple animations, saved into a animation collection
2. Open an existing animation, then make a new empty animation
3. Change from seconds to fps, or add a new property to animate ()
4. Editor crashes

NOTE: It is slightly random and I have not found a perfect repro

### Minimal reproduction project

N/A (TBD?)
arr[0] = value;
			arr[1] = -0.25;
			arr[2] = 0;
			arr[3] = 0.25;
			arr[4] = 0;
			undo_redo->create_action(TTR("Add Track Key"));
			undo_redo->add_do_method(animation.ptr(), "track_insert_key", p_track, p_ofs, arr);
			undo_redo->add_undo_method(animation.ptr(), "track_remove_key_at_time", p_track, p_ofs);
			undo_redo->commit_action();
		} break;
		case Animation::TYPE_AUDIO: {
			Dictionary ak;
			ak["stream"] = Ref<Resource>();
			ak["start_offset"] = 0;
			ak["end_offset"] = 0;
			undo_redo->create_action(TTR("Add Track Key"));
			undo_redo->add_do_method(animation.ptr(), "track_insert_key", p_track, p_ofs, ak);
			undo_redo->add_undo_method(animation.ptr(), "track_remove_key_at_time", p_track, p_ofs);
			undo_redo->commit_action();
		} break;
		case Animation::TYPE_ANIMATION: {
			StringName anim = "[stop]";
			undo_redo->create_action(TTR("Add Track Key"));
			undo_redo->add_do_method(animation.ptr(), "track_insert_key", p_track, p_ofs, anim);
			undo_redo->add_undo_method(animation.ptr(), "track_remove_key_at_time", p_track, p_ofs);
			undo_redo->commit_action();
		} break;
	}
}
void AnimationTrackEditor::_add_method_key(const String &p_method) {