I'm getting this error when I open a chest and click on an area outside the UI panel. This can be seen in the demo as well.
NullReferenceException: Object reference not set to an instance of an object
Opsive.UltimateInventorySystem.UI.Panels.DisplayPanelCloser.OnPointerClick (UnityEngine.EventSystems.PointerEventData eventData) (at Assets/Opsive/UltimateInventorySystem/Scripts/UI/Panels/DisplayPanelCloser.cs:45)
UnityEngine.EventSystems.ExecuteEvents.Execute (UnityEngine.EventSystems.IPointerClickHandler handler, UnityEngine.EventSystems.BaseEventData eventData) (at Library/PackageCache/com.unity.ugui@1.0.0/Runtime/EventSystem/ExecuteEvents.cs:50)
UnityEngine.EventSystems.ExecuteEvents.Execute[T] (UnityEngine.GameObject target, UnityEngine.EventSystems.BaseEventData eventData, UnityEngine.EventSystems.ExecuteEvents+EventFunction`1[T1] functor) (at Library/PackageCache/com.unity.ugui@1.0.0/Runtime/EventSystem/ExecuteEvents.cs:262)
UnityEngine.EventSystems.EventSystem:Update() (at Library/PackageCache/com.unity.ugui@1.0.0/Runtime/EventSystem/EventSystem.cs:385)
NullReferenceException: Object reference not set to an instance of an object
Opsive.UltimateInventorySystem.UI.Panels.DisplayPanelCloser.OnPointerClick (UnityEngine.EventSystems.PointerEventData eventData) (at Assets/Opsive/UltimateInventorySystem/Scripts/UI/Panels/DisplayPanelCloser.cs:45)
UnityEngine.EventSystems.ExecuteEvents.Execute (UnityEngine.EventSystems.IPointerClickHandler handler, UnityEngine.EventSystems.BaseEventData eventData) (at Library/PackageCache/com.unity.ugui@1.0.0/Runtime/EventSystem/ExecuteEvents.cs:50)
UnityEngine.EventSystems.ExecuteEvents.Execute[T] (UnityEngine.GameObject target, UnityEngine.EventSystems.BaseEventData eventData, UnityEngine.EventSystems.ExecuteEvents+EventFunction`1[T1] functor) (at Library/PackageCache/com.unity.ugui@1.0.0/Runtime/EventSystem/ExecuteEvents.cs:262)
UnityEngine.EventSystems.EventSystem:Update() (at Library/PackageCache/com.unity.ugui@1.0.0/Runtime/EventSystem/EventSystem.cs:385)