Check if a Tkinter listbox has selected elements or not

I have to check in an if statement if my Listbox() has one of its elemets selected or not.

Obviously, when I check it and its actually empty, it raises the error _tkinter.TclError: PRIMARY selection doesn't exist or form "STRING" not defined.

Is there a way (without exception handling) to check this out? Because I really need it to be a if stament.

My code is the following:

listboxTime = Listbox(...)

...

elif listboxTime.curselection() :
    tkinter.messagebox.showwarning("Error", "Error text")

...

The last thing I tried was with curselection() but it raises and index exception, because the list is empty. Any ideas? Thank you.