error "### Wrong alphabet used in MEME ###"

[RomainBlancMathieu]

Hello,
When running tffm_module.py I accountered the following error:
Wrong alphabet used in MEME

modifying line 1002 in tffm_module.py
FROM
if record.alphabet != IUPAC.unambiguous_dna:
TO
if record.alphabet != "".join(sorted(IUPAC.unambiguous_dna.letters)):
solved the problem.

is this just happening on my machine or do other persons had this issue?
In the latter case would it be possible to fix this line in the git version ?
Many thanks in advance!
Romain