Paul speaks the truth, without more information we can't do anything to assist.

 

My first guess is the JSF lifecycle.  That can cause things to run more then once depending on what you're doing.  BUT that's just a guess. 

Hello,

 

In fact I was building a kind of  wizard using extension library and panel controls.

 

I put two buttons on my xpage to do next / previous actions. In a SSJS I put the logical to hide the panels. I put the wizard step counter in the sessionScope. When doing next / previous action, sometimes (often) one single click call two times the function... I removed all the logical to do only simple Print and it does the same.

 

I started everything from scratch on a new xPages (calling the same code in a SSJS library and using the same custom controls) and everything's fine... 

 

Very strange and very tricky. 

 

Thank you for your help and best regards.