Reproduction steps:
1. Create a new project and install Adaptive Performance package
2. Go to Simulator Settings (Edit > Project Settings… > Adaptive Performance > Simulator)
3. Press on the disabled Framerate setting in the Default Scaler Profile dropdown
4. Observe the Console

Expected result: No errors are thrown
Actual result: “NullReferenceException: Object reference not set to an instance of an object“ error is thrown

Reproducible with: 5.1.0 (2021.3.41f1, 2022.3.39f1, 6000.0.12f1)
Not reproducible with: 5.0.2 (2022.3.39f1)

Reproduced on: macOS Sonoma 14.5 (Intel), Windows 11 (by the user)

Note:
Full error:
”NullReferenceException: Object reference not set to an instance of an object
UnityEditor.AdaptivePerformance.Editor.ProviderSettingsEditor.DrawScalerSetting (UnityEngine.Rect rect, UnityEditor.SerializedProperty scalerSetting, System.Boolean renderNotDisabled, UnityEditor.AdaptivePerformance.Editor.ProviderSettingsEditor+ScalerProfileSettingInformation scalerProfileSettingInfo) (at ./Library/PackageCache/com.unity.adaptiveperformance@5.1.0/Editor/Management/ProviderSettingsEditor.cs:479)
UnityEditor.AdaptivePerformance.Editor.ProviderSettingsEditor.DrawElementCallback (UnityEngine.Rect rect, System.Int32 index, System.Boolean isactive, System.Boolean isfocused) (at ./Library/PackageCache/com.unity.adaptiveperformance@5.1.0/Editor/Management/ProviderSettingsEditor.cs:333)
UnityEditorInternal.ReorderableList.DoListElements (UnityEngine.Rect listRect, UnityEngine.Rect visibleRect) (at /Users/bokken/build/output/unity/unity/Editor/Mono/GUI/ReorderableList.cs:993)
UnityEditorInternal.ReorderableList.DoLayoutList () (at /Users/bokken/build/output/unity/unity/Editor/Mono/GUI/ReorderableList.cs:752)
UnityEditor.AdaptivePerformance.Editor.ProviderSettingsEditor.DisplayScalerSettings () (at ./Library/PackageCache/com.unity.adaptiveperformance@5.1.0/Editor/Management/ProviderSettingsEditor.cs:289)
UnityEditor.AdaptivePerformance.Editor.ProviderSettingsEditor.DisplayBaseRuntimeSettings () (at ./Library/PackageCache/com.unity.adaptiveperformance@5.1.0/Editor/Management/ProviderSettingsEditor.cs:250)
UnityEditor.AdaptivePerformance.Simulator.Editor.SimulatorProviderSettingsEditor.OnInspectorGUI () (at ./Library/PackageCache/com.unity.adaptiveperformance@5.1.0/Editor/Provider/SimulatorProviderSettingsEditor.cs:25)
UnityEditor.AdaptivePerformance.Editor.AdaptivePerformanceConfigurationProvider.OnGUI (System.String searchContext) (at ./Library/PackageCache/com.unity.adaptiveperformance@5.1.0/Editor/Management/AdaptivePerformanceConfigurationProvider.cs:80)
UnityEditor.SettingsWindow.DrawControls () (at /Users/bokken/build/output/unity/unity/Editor/Mono/Settings/SettingsWindow.cs:440)
UnityEditor.SettingsWindow.DrawSettingsPanel () (at /Users/bokken/build/output/unity/unity/Editor/Mono/Settings/SettingsWindow.cs:411)
UnityEngine.UIElements.IMGUIContainer.DoOnGUI (UnityEngine.Event evt, UnityEngine.Matrix4x4 parentTransform, UnityEngine.Rect clippingRect, System.Boolean isComputingLayout, UnityEngine.Rect layoutSize, System.Action onGUIHandler, System.Boolean canAffectFocus) (at /Users/bokken/build/output/unity/unity/ModuleOverrides/com.unity.ui/Core/IMGUIContainer.cs:376)
UnityEngine.UIElements.IMGUIContainer.HandleIMGUIEvent (UnityEngine.Event e, UnityEngine.Matrix4x4 worldTransform, UnityEngine.Rect clippingRect, System.Action onGUIHandler, System.Boolean canAffectFocus) (at /Users/bokken/build/output/unity/unity/ModuleOverrides/com.unity.ui/Core/IMGUIContainer.cs:676)
UnityEngine.UIElements.IMGUIContainer.HandleIMGUIEvent (UnityEngine.Event e, System.Action onGUIHandler, System.Boolean canAffectFocus) (at /Users/bokken/build/output/unity/unity/ModuleOverrides/com.unity.ui/Core/IMGUIContainer.cs:648)
UnityEngine.UIElements.IMGUIContainer.HandleIMGUIEvent (UnityEngine.Event e, System.Boolean canAffectFocus) (at /Users/bokken/build/output/unity/unity/ModuleOverrides/com.unity.ui/Core/IMGUIContainer.cs:641)
UnityEngine.UIElements.IMGUIContainer.SendEventToIMGUIRaw (UnityEngine.UIElements.EventBase evt, System.Boolean canAffectFocus, System.Boolean verifyBounds) (at /Users/bokken/build/output/unity/unity/ModuleOverrides/com.unity.ui/Core/IMGUIContainer.cs:601)
UnityEngine.UIElements.IMGUIContainer.SendEventToIMGUI (UnityEngine.UIElements.EventBase evt, System.Boolean canAffectFocus, System.Boolean verifyBounds) (at /Users/bokken/build/output/unity/unity/ModuleOverrides/com.unity.ui/Core/IMGUIContainer.cs:590)
UnityEngine.UIElements.IMGUIContainer.ProcessEvent (UnityEngine.UIElements.EventBase evt) (at /Users/bokken/build/output/unity/unity/ModuleOverrides/com.unity.ui/Core/IMGUIContainer.cs:514)
UnityEngine.UIElements.CallbackEventHandler.HandleEvent (UnityEngine.UIElements.EventBase evt) (at /Users/bokken/build/output/unity/unity/ModuleOverrides/com.unity.ui/Core/Events/EventHandler.cs:267)
UnityEngine.UIElements.CallbackEventHandler.HandleEventAtCurrentTargetAndPhase (UnityEngine.UIElements.EventBase evt) (at /Users/bokken/build/output/unity/unity/ModuleOverrides/com.unity.ui/Core/Events/EventHandler.cs:189)
UnityEngine.UIElements.CallbackEventHandler.HandleEventAtTargetPhase (UnityEngine.UIElements.EventBase evt) (at /Users/bokken/build/output/unity/unity/ModuleOverrides/com.unity.ui/Core/Events/EventHandler.cs:173)
UnityEngine.UIElements.MouseCaptureDispatchingStrategy.DispatchEvent (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel) (at /Users/bokken/build/output/unity/unity/ModuleOverrides/com.unity.ui/Core/Events/MouseCaptureDispatchingStrategy.cs:88)
UnityEngine.UIElements.EventDispatcher.ApplyDispatchingStrategies (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel, System.Boolean imguiEventIsInitiallyUsed) (at /Users/bokken/build/output/unity/unity/ModuleOverrides/com.unity.ui/Core/EventDispatcher.cs:509)
UnityEngine.UIElements.EventDispatcher.ProcessEvent (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel) (at /Users/bokken/build/output/unity/unity/ModuleOverrides/com.unity.ui/Core/EventDispatcher.cs:444)
UnityEngine.UIElements.EventDispatcher.ProcessEventQueue () (at /Users/bokken/build/output/unity/unity/ModuleOverrides/com.unity.ui/Core/EventDispatcher.cs:395)
UnityEngine.UIElements.EventDispatcher.OpenGate () (at /Users/bokken/build/output/unity/unity/ModuleOverrides/com.unity.ui/Core/EventDispatcher.cs:348)
UnityEngine.UIElements.EventDispatcherGate.Dispose () (at /Users/bokken/build/output/unity/unity/ModuleOverrides/com.unity.ui/Core/EventDispatcher.cs:78)
UnityEngine.UIElements.EventDispatcher.ProcessEvent (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel) (at /Users/bokken/build/output/unity/unity/ModuleOverrides/com.unity.ui/Core/EventDispatcher.cs:500)
UnityEngine.UIElements.EventDispatcher.Dispatch (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel, UnityEngine.UIElements.DispatchMode dispatchMode) (at /Users/bokken/build/output/unity/unity/ModuleOverrides/com.unity.ui/Core/EventDispatcher.cs:244)
UnityEngine.UIElements.BaseVisualElementPanel.SendEvent (UnityEngine.UIElements.EventBase e, UnityEngine.UIElements.DispatchMode dispatchMode) (at /Users/bokken/build/output/unity/unity/ModuleOverrides/com.unity.ui/Core/Panel.cs:520)
UnityEngine.UIElements.UIElementsUtility.DoDispatch (UnityEngine.UIElements.BaseVisualElementPanel panel) (at /Users/bokken/build/output/unity/unity/ModuleOverrides/com.unity.ui/Core/UIElementsUtility.cs:477)
UnityEngine.UIElements.UIElementsUtility.UnityEngine.UIElements.IUIElementsUtility.ProcessEvent (System.Int32 instanceID, System.IntPtr nativeEventPtr, System.Boolean& eventHandled) (at /Users/bokken/build/output/unity/unity/ModuleOverrides/com.unity.ui/Core/UIElementsUtility.cs:205)
UnityEngine.UIElements.UIEventRegistration.ProcessEvent (System.Int32 instanceID, System.IntPtr nativeEventPtr) (at /Users/bokken/build/output/unity/unity/ModuleOverrides/com.unity.ui/Core/UIElementsUtility.cs:74)
UnityEngine.UIElements.UIEventRegistration+<>c.<.cctor>b__1_2 (System.Int32 i, System.IntPtr ptr) (at /Users/bokken/build/output/unity/unity/ModuleOverrides/com.unity.ui/Core/UIElementsUtility.cs:28)
UnityEngine.GUIUtility.ProcessEvent (System.Int32 instanceID, System.IntPtr nativeEventPtr, System.Boolean& result) (at /Users/bokken/build/output/unity/unity/Modules/IMGUI/GUIUtility.cs:203)”