Python If-statement not working as intended

I have a function that accepts pyqt combobox object and checks its current index.

def update_valpm(self,hp,pm):
    print(hp.currentIndex())
    if hp.currentIndex() != -1:
        if self.vrating == "230" or self.vrating == "240":
            vrating = "460"
        else:
            vrating = self.vrating
        if len(hp.currentText()) != 0:
            data = pd.read_csv("hp.csv", index_col = "HP")
            df = data.loc[[float(hp.currentText())],[vrating]]
            pm.setText(str(float(df.values)))

Now the problem is that if the currentIndex is equals to -1 it will execute the code below it when its not supposed to. Did I miss something? Suggestions will be greatly appreciated.