[Unity 2018.3.0f2] BUG Help!!!!!!!!!!!!!!

NullReferenceException: Object reference not set to an instance of an object

Chronos.ReorderableList.ReorderableListControl.PrepareState (Int32 controlID, IReorderableListAdaptor adaptor) (at Assets/Chronos/Source/Dependencies/ReorderableList/Editor/ReorderableListControl.cs:586)

Chronos.ReorderableList.ReorderableListControl.Draw (Int32 controlID, IReorderableListAdaptor adaptor, Chronos.ReorderableList.DrawEmpty drawEmpty) (at Assets/Chronos/Source/Dependencies/ReorderableList/Editor/ReorderableListControl.cs:1376)

Chronos.ReorderableList.ReorderableListControl.DrawControlFromState (IReorderableListAdaptor adaptor, Chronos.ReorderableList.DrawEmpty drawEmpty, ReorderableListFlags flags) (at Assets/Chronos/Source/Dependencies/ReorderableList/Editor/ReorderableListControl.cs:184)

Chronos.ReorderableList.ReorderableListGUI.DoListField (UnityEditor.SerializedProperty arrayProperty, Single fixedItemHeight, Chronos.ReorderableList.DrawEmpty drawEmpty, ReorderableListFlags flags) (at Assets/Chronos/Source/Dependencies/ReorderableList/Editor/ReorderableListGUI.cs:358)

Chronos.ReorderableList.ReorderableListGUI.ListField (UnityEditor.SerializedProperty arrayProperty, ReorderableListFlags flags) (at Assets/Chronos/Source/Dependencies/ReorderableList/Editor/ReorderableListGUI.cs:396)

Chronos.CustomRecorderEditor.OnInspectorGUI () (at Assets/Chronos/Source/Editor/CustomRecorderEditor.cs:24)

UnityEditor.InspectorWindow.DoOnInspectorGUI (Boolean rebuildOptimizedGUIBlock, UnityEditor.Editor editor, Boolean wasVisible, UnityEngine.Rect& contentRect) (at C:/buildslave/unity/build/Editor/Mono/Inspector/InspectorWindow.cs:1625)

UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr)