Qt MainWindow crashes upon button click - c++

Question

I've used Qt's MainWindow class before, and I have never had any problems.
Right now, I have a button called addLocation that is supposed to create a QInputDialog and get a string from the user, and add it to a QStringList called locationList, which is a public field of my uiactions.h file, declared like this within the header:
class UiActions{
public:
QStringList locationList;
//function prototypes
};
I have a function in my mainwindow.cpp file to handle the event of my addLocation button being clicked, defined as such:
void MainWindow::on_addLocation_clicked()
{
UiActions actions;
actions.addLocation();
}
And my addLocation function is defined as follows in my uiactions.cpp file:
void UiActions::addLocation()
{
bool j; //Input Dialog Handler
QDebug debugTxt(QtDebugMsg);
locationList << QInputDialog::getText(NULL, "Add Location",
"Location Name:", QLineEdit::Normal,
NULL, &j);
}
Whenever I click the addLocation button, the program shows an input dialog, lets me type something, and then hangs for a few seconds and crashes after clicking "ok."
I added some lines under the input dialog to see if the problem was in the QInputDialog, like this:
if(j){
debugTxt << "Input dialog success";
}
else{
debugTxt << "Input failed.";
}
And it would print out "Input dialog success" to the debug console, telling me the problem is not in my use of the QInputDialog.
When it crashes, this is all the error information I get:
The program has unexpectedly finished.
[insert path to EXE here] crashed
I believe this is all of the relevant information. What would be causing the program to crash?
EDIT: I ran with the debugger (should have done this first) and I'm getting a segmentation fault. I wonder what would be causing this, as I'm not doing any pointer trickery. I have a suspicion that it has something to do with the way I'm using QStringList locationList
The highlighted assembly is 0x64942cb6 <+0x0000> cmpl $0xbab1f00d,(%edx)
EDIT 2: I made a modification to the click event for my addLocation button, which is in my mainwindow.cpp file.
void MainWindow::on_addLocation_clicked()
{
UiActions actions;
//actions.addLocation();
actions.locationList << "Test Location" << "Other Data";
}
I get the same error when I try to add something to a QStringList field in the uiactions.h file as well. I'm almost positive I'm trying to access the data in there incorrectly now. Here's the interesting thing though. I have another button which I use to save the data in locationList to a text file, defined like this in my uiactions.cpp file:
bool UiActions::saveLocationList()
{
ofstream file;
file.open ("Location List.txt");
for(int i = 0;i < locationList.size(); i++){
file << locationList[i].toUtf8().data() << "\n";
}
file.close();
return true;
}
which works fine.
EDIT 3: I added a debug line: debugTxt << "\n" << locationList[0]; to the addLocation click event to see if the data was actually getting put into locationList, and it is. I'm completely confused now, since it seems I actually am accessing locationList correctly.