OSError: Header missing END card.

Sentry Issue: GWCELERY-Y8

UnicodeDecodeError: 'ascii' codec can't decode byte 0x89 in position 0: ordinal not in range(128)
  File "astropy/io/fits/hdu/base.py", line 407, in _readfrom_internal
    header_str, header = _BasicHeader.fromfile(data)
  File "astropy/io/fits/header.py", line 2081, in fromfile
    header_str, cards = parse_header(fileobj)
  File "astropy/io/fits/_utils.pyx", line 38, in astropy.io.fits._utils.parse_header

OSError: Header missing END card.
(12 additional frame(s) were not displayed)
...
  File "astropy/io/fits/hdu/hdulist.py", line 1139, in _read_next_hdu
    hdu = _BaseHDU.readfrom(fileobj, **kwargs)
  File "astropy/io/fits/hdu/base.py", line 328, in readfrom
    **kwargs)
  File "astropy/io/fits/hdu/base.py", line 415, in _readfrom_internal
    endcard=not ignore_missing_end)
  File "astropy/io/fits/header.py", line 514, in fromfile
    padding)[1]
  File "astropy/io/fits/header.py", line 596, in _from_blocks
    raise OSError('Header missing END card.')