RayCast in WebGL not working

Hi,

I'm having an issue with RayCasts not working in a WebGL build. The issue exists in both Chrome and Firefox. It works fine in the editor and in a PC-standalone build.

I'm using Unity version 2017.4.0f1 Personal.

I'm using the following code:

  void Update()
         {            
             Ray detectobject = Camera.main.ScreenPointToRay(Input.mousePosition);
             Debug.DrawRay(detectobject.origin, detectobject.direction * 10, Color.yellow);
             Physics.Raycast(detectobject, out hit, 100);
 
 
             if (Input.GetButtonDown("Fire1") && hit.transform != null && hit.transform.tag == "Territory" && !EventSystem.current.IsPointerOverGameObject())
             {
                 SelectTerritory();
             }
 
             if (Input.GetButtonDown("Fire2") && hit.transform != null && hit.transform.tag == "Territory" && !EventSystem.current.IsPointerOverGameObject() && selectedTerritory != null && selectedTerritory.GetComponent<Territory>().unitList.Count > 0) 
             {
                 SelectTargetTerritory();
             }
 
         }

Any help would be greatly appreciated.

Regards, Rob