Recycler Paging does not work

[Brusura]

As you open the recycler with a list bigger than it can actualy display this execption is thrown when you mouse over the parts and the next button does nothing:

NullReferenceException: Object reference not set to an instance of an object
at Workshop.OseModuleRecycler.DrawWindowContents (Int32 windowId) [0x00000] in :0
at UnityEngine.GUI.CallWindowDelegate (UnityEngine.WindowFunction func, Int32 id, UnityEngine.GUISkin _skin, Int32 forceRect, Single width, Single height, UnityEngine.GUIStyle style) [0x00000] in :0