Nill value when vehicle is missing on vehicle list

Fixed error "attempt to index a nil value (local 'firstVehicleData')" when vehicle doesn't exist on vehicle list/database.

client/main.lua

@@ -705,20 +705,22 @@ AddEventHandler('esx_vehicleshop:hasEnteredMarker', function(zone)
 					end
 				end
 
-				resellPrice = ESX.Math.Round(vehicleData.price / 100 * Config.ResellPercentage)
-				model = GetEntityModel(vehicle)
-				plate = ESX.Math.Trim(GetVehicleNumberPlateText(vehicle))
+				if vehicleData then
+					resellPrice = ESX.Math.Round(vehicleData.price / 100 * Config.ResellPercentage)
+					model = GetEntityModel(vehicle)
+					plate = ESX.Math.Trim(GetVehicleNumberPlateText(vehicle))
 
-				CurrentAction     = 'resell_vehicle'
-				CurrentActionMsg  = _U('sell_menu', vehicleData.name, ESX.Math.GroupDigits(resellPrice))
+					CurrentAction     = 'resell_vehicle'
+					CurrentActionMsg  = _U('sell_menu', vehicleData.name, ESX.Math.GroupDigits(resellPrice))
 
-				CurrentActionData = {
-					vehicle = vehicle,
-					label = vehicleData.name,
-					price = resellPrice,
-					model = model,
-					plate = plate
-				}
+					CurrentActionData = {
+						vehicle = vehicle,
+						label = vehicleData.name,
+						price = resellPrice,
+						model = model,
+						plate = plate
+					}
+				end
 			end
 		end