What were you trying to do that didn't work?I

I'm trying to convert my centos 7.9 system to rhel7 using convert2rhel analyze

Please provide the package NVR for which bug is seen:

How reproducible: every time

Steps to reproduce

1. run convert2rhel analyze
2. It will throw the error below
3.  

Expected results

Convert with no error

Actual results

I get this error (the only one):

========== Error (Must fix before conversion) ==========
(ERROR) EFI::UNEXPECTED_ERROR - Unhandled exception caught
     Description: Unhandled exception was caught: invalid literal for int() with base 10: ''
    Please file a bug at https://issues.redhat.com/ to have this fixed or a specific error message added.
    Traceback: Traceback (most recent call last):
      File "/usr/lib/python2.7/site-packages/convert2rhel/actions/_init_.py", line 572, in run
        action.run()
      File "/usr/lib/python2.7/site-packages/convert2rhel/actions/system_checks/efi.py", line 74, in run
        grub.get_device_number(grub.get_efi_partition())
      File "/usr/lib/python2.7/site-packages/convert2rhel/grub.py", line 178, in get_device_number
        return int(partition_number)
    ValueError: invalid literal for int() with base 10: ''

     Diagnosis: N/A
     Remediations: N/A