# Buggy code
def saveDataSet(self, event):
    """
    Saves the final dataframe
    """

    # Backup previous save
    from sys import platform

    csv_path = os.path.join(self.dir, "CollectedData_" + self.scorer + ".csv")
    hdf_path = os.path.join(self.dir, "CollectedData_" + self.scorer + ".h5")
    csv_backup_path = csv_path.replace(".csv", ".csv.backup")
    hdf_backup_path = hdf_path.replace(".h5", ".h5.backup")

    if platform == "linux" or platform == "linux2":
        if os.path.exists(csv_path):
            os.rename(csv_path, csv_backup_path)

        if os.path.exists(hdf_path):
            os.rename(hdf_path, hdf_backup_path)

    elif platform == "win32":
        if os.path.exists(csv_path):
            if os.path.exists(csv_backup_path):  # check if backupfile exists already
                os.remove(
                    csv_backup_path
                )  # requires double action as windows fails to rename file if exists already
                os.rename(csv_path, csv_backup_path)

        if os.path.exists(hdf_path):
            if os.path.exists(hdf_backup_path):
                os.remove(hdf_backup_path)
                os.rename(hdf_path, hdf_backup_path)

    elif platform == "darwin":
        try:
            if os.path.exists(csv_path):
                os.rename(csv_path, csv_backup_path)

            if os.path.exists(hdf_path):
                os.rename(hdf_path, hdf_backup_path)
        except:
            print(" Unexpected os.rename behaviour, try win32 approach")

    self.statusbar.SetStatusText("File saved")
    MainFrame.saveEachImage(self)
    MainFrame.updateZoomPan(self)

    # Drop Nan data frames
    self.dataFrame = self.dataFrame.dropna(how="all")

    # Windows compatible
    self.dataFrame.sort_index(inplace=True)
    self.dataFrame = self.dataFrame.reindex(
        self.bodyparts,
        axis=1,
        level=self.dataFrame.columns.names.index("bodyparts"),
    )
    self.dataFrame.to_csv(csv_path)
    self.dataFrame.to_hdf(hdf_path, "df_with_missing", format="table", mode="w")


# Traceback (IndexError)
pythonw -m deeplabcut
Starting GUI...
Found new frames..
Traceback (most recent call last):
File "/Users/brandonjackson/opt/miniconda3/envs/dlc/lib/python3.7/site-packages/deeplabcut/generate_training_dataset/labeling_toolbox.py", line 767, in nextImage
self.updatedCoords = MainFrame.getLabels(self, self.iter)
File "/Users/brandonjackson/opt/miniconda3/envs/dlc/lib/python3.7/site-packages/deeplabcut/generate_training_dataset/labeling_toolbox.py", line 845, in getLabels
self.dataFrame[self.scorer][bp]["x"].values[self.iter],
IndexError: index 1 is out of bounds for axis 0 with size 1

# Fixed code
def saveDataSet(self, event):
    """
    Saves the final dataframe
    """
    self.statusbar.SetStatusText("File saved")
    MainFrame.saveEachImage(self)
    MainFrame.updateZoomPan(self)

    # Windows compatible
    self.dataFrame.sort_index(inplace=True)
    self.dataFrame = self.dataFrame.reindex(
        self.bodyparts,
        axis=1,
        level=self.dataFrame.columns.names.index("bodyparts"),
    )
    self.dataFrame.to_csv(
        os.path.join(self.dir, "CollectedData_" + self.scorer + ".csv")
    )
    self.dataFrame.to_hdf(
        os.path.join(self.dir, "CollectedData_" + self.scorer + ".h5"),
        "df_with_missing",
        format="table",
        mode="w",
    )