I am quite new to this, so just experimenting with glsl. I have implement a simple vp rotation matrix with gl.shader object and it works. The problem is that some times when I try to open the patch max crashes.

Here is my glsl patch and the crash report.

Maybe the problem is in my code. Can anyone advise me?

I am quite new to this, so just experimenting with glsl. I have implement a simple vp rotation matrix with gl.shader object and it works. The problem is that some times when I try to open the patch max crashes. 

Here is my glsl patch and the crash report. 

crashing shader