Check if no webcam

I'm getting an "Array index is out of range" error on the if statement of the following code.

 private var webCamTexture : WebCamTexture;
 
 function Start () {
     
     if (WebCamTexture.devices.Length > 0) {
     
         //Get device
         var deviceName = WebCamTexture.devices[0].name;
         
         //Create web cam texture from device
         webCamTexture = new WebCamTexture(deviceName, 640, 360, 30);
         
         //Play the web cam texture
         webCamTexture.Play();
         
         //Change this objects texture to the web cam texture
         renderer.material.mainTexture = webCamTexture;
         
     }
 }

I thought this would be how to check if there are no webcams on the system.