Web app crashes only on Cloud

I am new to deploying web apps to Xojo Cloud. I have developed and debugged four web apps, and three of the four run fine on Xojo Cloud. But one (which operates perfectly on my own Mac in debug mode) crashes (goes offline) under certain repeatable conditions when deployed to Xojo Cloud. The problem appears to be correlated with supplying a XojoScript with code that involves a variable (which should be available in the XojoScript context) as opposed to a constant. But how do I tell, since everything works great in the debugger? Is using XojoScripts in a web app problematic for some reason?

Hi Thomas - I will reply to your email about this.