Incorrect warning from checkpatch

Pipeline Job

WARNING: Unknown commit id '918c66fd4126', maybe rebased or not pulled?
#15: 
Fixes: 918c66fd4126 ("[media] coda: add CODA7541 decoding support")

But when I look into my tree, I can find the commit with a problem:

✦ ❯ git show 918c66fd4126
commit 918c66fd41268ec34bba0a82f4221ddc18e9501b
Author: Philipp Zabel <p.zabel@pengutronix.de>
Date:   Thu Jun 27 06:59:01 2013 -0300

    [media] coda: add CODA7541 decoding support

This doesn't happen for each patch-set but for some. (As not all patch sets contain a Fixes tag) Thanks.