diff --git a/VECTO/GUI/VehicleForm.vb b/VECTO/GUI/VehicleForm.vb
index dc9ff33ba68074bccdc34784f5282be84b57d7ec..484dc90a8a31292ecd88f02646c76c859a645499 100644
--- a/VECTO/GUI/VehicleForm.vb
+++ b/VECTO/GUI/VehicleForm.vb
@@ -362,7 +362,7 @@ Public Class VehicleForm
 		TbMassExtra.Text = vehicle.CurbMassExtra.ToGUIFormat()
 		TbLoad.Text = vehicle.Loading.ToGUIFormat()
 		TBrdyn.Text = (vehicle.DynamicTyreRadius.Value() * 1000).ToGUIFormat()
-		tbVehIdlingSpeed.Text = vehicle.EngineIdleSpeed.AsRPM.ToGUIFormat()
+		tbVehIdlingSpeed.Text = If(vehicle.EngineIdleSpeed Is Nothing, "", vehicle.EngineIdleSpeed.AsRPM.ToGUIFormat())
 
 		CbCdMode.SelectedValue = airdrag.CrossWindCorrectionMode
 		TbCdFile.Text =