Kicad-cli triggers error - post processing python script

Software
1

I have a python script that generates manufacturing files in a proper structure for me. This script was working pretty well for KiCad 8.0. With 9.0 I got an error message for this code:

# List of layers to export as Gerber files
layers1 = [
    "F.Cu",
    "In1.Cu",
    "In2.Cu",
    "In3.Cu",
    "In4.Cu",
    "In5.Cu",
    "In6.Cu",
    "B.Cu",
    "F.Paste",
    "B.Paste",
    "F.SilkS",
    "B.SilkS",
    "F.Mask",
    "B.Mask",
    "Edge.Cuts",
    "Edge.Cuts,B.Adhesive"
]

# Create the base command for exporting Gerber files
base_command = f"kicad-cli pcb export gerbers {pcb_file} --output {gerberPath} --use-drill-file-origin"

# Loop through each layer and generate the corresponding Gerber file
layer_command = f"{base_command} --layers "
for layer in layers1:
    layer_command = layer_command + f"{layer},"
print(layer_command)
subprocess.call(layer_command)

Running this, I got this terminal output:

Plotted to 'path..\super_project-Edge_Cuts.gm1'.
C:\jenkins\workspace\build-windows-kicad-msvc-9.0-stable\.build\kicad\pcbnew\board_item.cpp(43): assert "m_group == nullptr" failed in BOARD_ITEM::~BOARD_ITEM().

C:\jenkins\workspace\build-windows-kicad-msvc-9.0-stable\.build\kicad\pcbnew\board_item.cpp(43): assert "m_group == nullptr" failed in BOARD_ITEM::~BOARD_ITEM().
C:\jenkins\workspace\build-windows-kicad-msvc-9.0-stable\.build\kicad\pcbnew\board_item.cpp(43): assert "m_group == nullptr" failed in BOARD_ITEM::~BOARD_ITEM().
C:\jenkins\workspace\build-windows-kicad-msvc-9.0-stable\.build\kicad\pcbnew\board_item.cpp(43): assert "m_group == nullptr" failed in BOARD_ITEM::~BOARD_ITEM().
C:\jenkins\workspace\build-windows-kicad-msvc-9.0-stable\.build\kicad\pcbnew\board_item.cpp(43): assert "m_group == nullptr" failed in BOARD_ITEM::~BOARD_ITEM().
C:\jenkins\workspace\build-windows-kicad-msvc-9.0-stable\.build\kicad\pcbnew\board_item.cpp(43): assert "m_group == nullptr" failed in BOARD_ITEM::~BOARD_ITEM().
C:\jenkins\workspace\build-windows-kicad-msvc-9.0-stable\.build\kicad\pcbnew\board_item.cpp(43): assert "m_group == nullptr" failed in BOARD_ITEM::~BOARD_ITEM().
C:\jenkins\workspace\build-windows-kicad-msvc-9.0-stable\.build\kicad\pcbnew\board_item.cpp(43): assert "m_group == nullptr" failed in BOARD_ITEM::~BOARD_ITEM().
C:\jenkins\workspace\build-windows-kicad-msvc-9.0-stable\.build\kicad\pcbnew\board_item.cpp(43): assert "m_group == nullptr" failed in BOARD_ITEM::~BOARD_ITEM().
C:\jenkins\workspace\build-windows-kicad-msvc-9.0-stable\.build\kicad\pcbnew\board_item.cpp(43): assert "m_group == nullptr" failed in BOARD_ITEM::~BOARD_ITEM().
C:\jenkins\workspace\build-windows-kicad-msvc-9.0-stable\.build\kicad\pcbnew\board_item.cpp(43): assert "m_group == nullptr" failed in BOARD_ITEM::~BOARD_ITEM().
C:\jenkins\workspace\build-windows-kicad-msvc-9.0-stable\.build\kicad\pcbnew\board_item.cpp(43): assert "m_group == nullptr" failed in BOARD_ITEM::~BOARD_ITEM().
C:\jenkins\workspace\build-windows-kicad-msvc-9.0-stable\.build\kicad\pcbnew\board_item.cpp(43): assert "m_group == nullptr" failed in BOARD_ITEM::~BOARD_ITEM().

And an error message pops:
image

If I hit cancel, the error dismisses, however I am not sure if this is a problem or not. The gerber files are produced, the gm1 file is also there.