Debug a small Qt / C++ program on Linux

Hello, I'm making a program to view running processes on Linux in a QTableWidget. I am using a QThread to update the QTableWidget, and I've added filtering with a QLineEdit, up to there everything works. Now I've added access to a SLOT called killProcessFromLineEdit() from a button click, but what appends is that I can't access my other QLineEdit called processIdToKill, it crashes the program without any compilation notice. I wonder if it is the range of my UI objects that make the program crash when the signal contacts the slot, as the program crashes if I try to reach any Widget from the slot. I use QtCreator as environment and Linux with C++ The code can be directly browsed or downloaded from : [login to view URL] I am looking for someone who would help me on this, and maybe more in the future. Thanks Patrick