NullReferenceException: Object reference not set to an instance of an object
Opsive.UltimateInventorySystem.Core.InventoryCollections.GroupItemRestrictionObject.Opsive.UltimateInventorySystem.Core.IDatabaseSwitcher.IsComponentValidForDatabase (Opsive.UltimateInventorySystem.Storage.InventorySystemDatabase database) (at Assets/Opsive/UltimateInventorySystem/Scripts/Core/InventoryCollections/GroupItemRestrictionObject.cs:33)
Opsive.UltimateInventorySystem.Editor.Inspectors.DatabaseInspectorBase.DrawContent () (at Assets/Opsive/UltimateInventorySystem/Editor/Inspectors/DatabaseInspectorBase.cs:83)
Opsive.UltimateInventorySystem.Editor.Inspectors.DatabaseInspectorBase.DatabaseChanged () (at Assets/Opsive/UltimateInventorySystem/Editor/Inspectors/DatabaseInspectorBase.cs:66)
Opsive.UltimateInventorySystem.Editor.Inspectors.DatabaseInspectorBase.DrawInOrder (UnityEngine.UIElements.VisualElement parent, System.Boolean nested) (at Assets/Opsive/UltimateInventorySystem/Editor/Inspectors/DatabaseInspectorBase.cs:50)
Opsive.UltimateInventorySystem.Editor.Inspectors.InspectorBase.CreateInspectorGUI () (at Assets/Opsive/UltimateInventorySystem/Editor/Inspectors/InspectorBase.cs:32)
UnityEditor.UIElements.InspectorElement.CreateInspectorElementFromEditor (UnityEditor.Editor editor, System.Boolean reuseIMGUIContainer) (at <d0ffe769b7a34b4cac3a7cdc5c696293>:0)
UnityEditor.UIElements.InspectorElement.Reset (UnityEditor.SerializedObject bindObject) (at <d0ffe769b7a34b4cac3a7cdc5c696293>:0)
UnityEditor.UIElements.InspectorElement.ExecuteDefaultActionAtTarget (UnityEngine.UIElements.EventBase evt) (at <d0ffe769b7a34b4cac3a7cdc5c696293>:0)
UnityEngine.UIElements.CallbackEventHandler.HandleEvent (UnityEngine.UIElements.EventBase evt) (at <57fa7f4ad1c34ed185465e0a9f71c244>:0)
UnityEngine.UIElements.CallbackEventHandler.HandleEventAtTargetPhase (UnityEngine.UIElements.EventBase evt) (at <57fa7f4ad1c34ed185465e0a9f71c244>:0)
UnityEditor.UIElements.BindingExtensions.SendBindingEvent[TEventType] (TEventType evt, UnityEngine.UIElements.VisualElement target) (at <d0ffe769b7a34b4cac3a7cdc5c696293>:0)
UnityEditor.UIElements.BindingExtensions.Bind (UnityEngine.UIElements.VisualElement element, UnityEditor.UIElements.BindingExtensions+SerializedObjectUpdateWrapper objWrapper, UnityEditor.SerializedProperty parentProperty) (at <d0ffe769b7a34b4cac3a7cdc5c696293>:0)
UnityEditor.UIElements.BindingExtensions.Bind (UnityEngine.UIElements.VisualElement element, UnityEditor.SerializedObject obj) (at <d0ffe769b7a34b4cac3a7cdc5c696293>:0)
UnityEditor.UIElements.InspectorElement..ctor (UnityEditor.Editor editor, UnityEditor.UIElements.InspectorElement+Mode mode) (at <d0ffe769b7a34b4cac3a7cdc5c696293>:0)
UnityEditor.UIElements.EditorElement.Init () (at <d0ffe769b7a34b4cac3a7cdc5c696293>:0)
UnityEditor.UIElements.EditorElement..ctor (System.Int32 editorIndex, UnityEditor.InspectorWindow iw) (at <d0ffe769b7a34b4cac3a7cdc5c696293>:0)
UnityEditor.InspectorWindow.DrawEditors (UnityEditor.Editor[] editors) (at <d0ffe769b7a34b4cac3a7cdc5c696293>:0)
UnityEditor.InspectorWindow.RebuildContentsContainers () (at <d0ffe769b7a34b4cac3a7cdc5c696293>:0)
UnityEditor.InspectorWindow.RedrawFromNative () (at <d0ffe769b7a34b4cac3a7cdc5c696293>:0)
UnityEditor.HostView:OnLostFocus()