QSqlTableModel(): Add an empty record with an auto-increment column

[PythonQTMarlem]

Hello,
the first column of my table is auto-increment.
I want to add an empty record to the end of the table.

Here is my attempt:

def add_record(self):
        record = self.table_model.record()
        record.setValue(self.table_model.rowCount()+1, '','','')
        self.table_model.insertRecord(self.table_model.rowCount(), record)

When executed, the program crashes with the following error message:
Process finished with exit code -1073740791 (0xC0000409)

Question:
How does it work without a program crash?

[PythonQTMarlem]

sorry, it is easy:

    def datensatz_hinzufuegen(self):
        self.table_model.insertRow(self.table_model.rowCount())