How to reproduce:
1. Open the attached 'project-1178254.zip' project using the EnvIronman VM (optional) (more information in Edit)
2. Select 'BugRecorderList' in the Project window
3. Enter and exit Play mode
4. Observe the Console window

Expected result: no exceptions are thrown
Actual result: NullReferenceException is thrown

Reproducible with: 2018.4.7f1, 2019.2.3f1, 2019.3.0b1, 2020.1.0a1 (2.0.0, 2.0.2)

Notes:
1) Selecting the Recorder List Asset after entering (and exiting) Play mode for the first time throws the exception without needing to enter Play mode
2) Deleting the Recorder List Asset and entering Play mode throws InvalidCastException
3) De-selecting the Recorder List Asset and entering Play mode for the second time throws KeyNotFoundException (reproducible with 2019.2.3f1)
4) Entering Play mode for the second time after deleting the Recorder List Asset starts throwing KeyNotFoundException (reproducible with 2019.3.0b1, 2020.1.0a1)
5) Re-opening the project fixes this behavior until a Recorder List Asset is selected and Play mode is entered

'NullReferenceException' exception:
NullReferenceException: Object reference not set to an instance of an object
UnityEditor.Presets.PresetEditor.GenerateInternalEditor () (at C:/buildslave/unity/build/Modules/PresetsEditor/PresetEditor.cs:165)
UnityEditor.Presets.PresetEditor.OnEnable () (at C:/buildslave/unity/build/Modules/PresetsEditor/PresetEditor.cs:58)
UnityEditor.Recorder.RecorderControllerSettingsPresetEditor:OnEnable()