ArgumentNullException on first Play

[CDTR-MattConroy]

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Describe the bug
ArgumentNullException is intermittently thrown whene existing Play mode the first time after re-opening the Editor.

To Reproduce
Steps to reproduce the behavior:

1. Close Unity
2. Open Unity
3. Enter Play mode
4. See error

Expected behavior
No exception is thrown

Environment (please complete the following information):

• Version [3.2.4]
• Platform: [Editor(Windows)]
• Unity version: [2023.2.20f1]

Additional context

ArgumentNullException: Value cannot be null.
Parameter name: objectToOverwrite
UnityEditor.EditorJsonUtility.FromJsonOverwrite (System.String json, System.Object objectToOverwrite) (at <8f5ff83e453e49179847370b820a0398>:0)
Coffee.UISoftMaskInternal.PreloadedProjectSettings`1[T].OnPlayModeStateChanged (UnityEditor.PlayModeStateChange state) (at ./Library/PackageCache/com.coffee.softmask-for-ugui@3.2.4/Runtime/Internal/ProjectSettings/PreloadedProjectSettings.cs:169)
UnityEditor.EditorApplication.Internal_PlayModeStateChanged (UnityEditor.PlayModeStateChange state) (at <8f5ff83e453e49179847370b820a0398>:0)
UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr, Boolean&)

[mob-sakai]

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