@JuanNunez I deleted my first response as I did not realised that it was about a signal and one does not have to implement a signal.
Did you try a complete rebuild after adding signal? Delete build folder, run qmake and build.

My behavior correction patch for this one has also gone through to be available in 6.0/the current dev build

https://codereview.qt-project.org/c/qt/qtbase/+/312083

Cheers.

Doing so ensure the proper behaviour. If you connect anything that doesn't do it, you'll still avoid the signal storm.

Thanks for all. I should test it , if it works I will put the code completely here.

Hi,

Just a quick note, taking a look at fixing this "fix", I just saw that the latest version of the contrib repository doesn't contain the offending code anymore.

It solved. I have a silly mistake. I call slot when my form is null and does not create.
In that example in stackoverflow both form create and they connect the signal and slot . but my second form is null.