In some (also modding-related) scenarios by the time the SCR_InvCallBack is executed the OnItemAdded or other events might have deleted it already, causing the line:
enfusion://ScriptEditor/Scripts/Game/UI/Inventory/SCR_InventoryMenuUI.c;94

auto itemStorage = BaseInventoryStorageComponent.Cast(m_pItem.FindComponent(BaseInventoryStorageComponent));

to throw a null pointer exception. Please add a simple if(m_pItem) check before trying to get the component. The check is in place for other cases already in the code, just not this one.

enfusion://ScriptEditor/Scripts/Game/Inventory/SCR_InventoryStorageManagerComponent.c;280

RplComponent rplComp = RplComponent.Cast(entity.FindComponent(RplComponent));

Similar situation here ...