Qt Application quits after slot of QAction gets triggered

I've created an action for my QMenu and connected it to a slo开发者_运维百科t "action1" like this

connect(action, SIGNAL(triggered()), this, SLOT(action1()));

but when i execute this code, my application quits.

How to solve this?

Could be a multitude of things, but for starters:

• Is the "triggered" signal also connected to another slot? e.g. the "quit" slot of the application?
• Does "action1" close the window? I seem to remember that Qt by default quits the application when the last window is closed.