diff --git a/[core]/es_extended/client/functions.lua b/[core]/es_extended/client/functions.lua
index 5959ccac..8a577e7e 100644
--- a/[core]/es_extended/client/functions.lua
+++ b/[core]/es_extended/client/functions.lua
@@ -530,10 +530,14 @@ end
 ---@param vehicleModel integer | string The vehicle to spawn
 ---@param coords table | vector3 The coords to spawn the vehicle at
 ---@param heading number The heading of the vehicle
----@param cb? function The callback function
+---@param cb? fun(vehicle: number) The callback function
 ---@param networked? boolean Whether the vehicle should be networked
 ---@return number? vehicle
 function ESX.Game.SpawnVehicle(vehicleModel, coords, heading, cb, networked)
+    if cb and not ESX.IsFunctionReference(cb) then
+        error("Invalid callback function")
+    end
+
     local model = type(vehicleModel) == "number" and vehicleModel or joaat(vehicleModel)
     local vector = type(coords) == "vector3" and coords or vec(coords.x, coords.y, coords.z)
     local isNetworked = networked == nil or networked
diff --git a/[core]/es_extended/server/modules/onesync.lua b/[core]/es_extended/server/modules/onesync.lua
index 67111602..cb914a17 100644
--- a/[core]/es_extended/server/modules/onesync.lua
+++ b/[core]/es_extended/server/modules/onesync.lua
@@ -123,9 +123,9 @@ function ESX.OneSync.SpawnVehicle(model, coords, heading, properties, cb)
             local networkId = NetworkGetNetworkIdFromEntity(createdVehicle)
             Entity(createdVehicle).state:set("VehicleProperties", vehicleProperties, true)
             if promise then
-                return promise:resolve(networkId)
+                promise:resolve(networkId)
             elseif cb then
-                return cb(networkId)
+                cb(networkId)
             end
         end)
     end)