Creative players cannot throw ender pearls.

src/Items/ItemThrowable.h

@@ -89,6 +89,22 @@ public:
 		super(E_ITEM_ENDER_PEARL, cProjectileEntity::pkEnderPearl, 30)
 	{
 	}
+	
+	virtual bool OnItemUse(cWorld * a_World, cPlayer * a_Player, const cItem & a_Item, int a_BlockX, int a_BlockY, int a_BlockZ, eBlockFace a_Dir) override
+	{
+		// Creative players cannot throw ender pearls.
+		if (a_Player->IsGameModeCreative())
+		{
+			return false;
+		}
+		
+		a_Player->GetInventory().RemoveOneEquippedItem();
+		Vector3d Pos = a_Player->GetThrowStartPos();
+		Vector3d Speed = a_Player->GetLookVector() * m_SpeedCoeff;
+		a_World->CreateProjectile(Pos.x, Pos.y, Pos.z, m_ProjectileKind, a_Player, a_Player->GetEquippedItem(), &Speed);
+		
+		return true;
+	}
 } ;