why try / catch don't gone?

Hi,

I'm having problems with play() a WebCamTexture in unity webplayer.

I'm trying to make a try/catch but i don't know how to do it.

try { this._wtx.Play(); Debug.Log ("try ok"); } catch { Debug.Log ("ERROR al Play"); }

at unity engine Works ok and make play() but when i go browser unitywebplayer crash and if i see the .log file i don't see the debug.log("Error al Play");

thanks