Annoying NoUser@NoGroup

[SmT]

Hi!!
I have an annoying problem....
Why is NoUser in NoGroup keeps showing up?
I have no user called NoUser and no group called NoGroup, but it keeps showing up now and then, and always just 1 file...
I need help on this..
Anyone seen this before?
Please help me out if you know anything...

[ 23:42:23 ] [ blabla ] CUSTOM-SWESUB - UserTop: ·
[ 23:42:27 ] [ blabla] CUSTOM-SWESUB - 1. user1@grp1 [2.8GB/61F/ 67%/4924KB/s] - [wkup #2 - allup #11] ·
[ 23:42:29 ] [ blabla] CUSTOM-SWESUB - 2. user2@grp2 [1.4GB/30F/ 32%/3617KB/s] - [wkup #3 - allup #8] ·
[ 23:42:31 ] [ blabal] CUSTOM-SWESUB - 3. NoUser@NoGroup [47.7MB/1F/ 1%/1KB/s] - [wkup #0 - allup #0] ·
[ 23:42:33 ] [ blabla] CUSTOM-SWESUB - GroupTop: ·
[ 23:42:35 ] [ blabla] CUSTOM-SWESUB - 1. grp1 [2.8GB/61F/ 67%/4924KB/s] ·
[ 23:42:37 ] [ blabla] CUSTOM-SWESUB - 2. grp2 [1.4GB/30F/ 32%/3617KB/s] ·
[ 23:42:39 ] [ blabla] CUSTOM-SWESUB - 3. NoGroup [47.7MB/1F/ 1%/1KB/s] ·

SmT

[r3flux]

I have no user called NoUser and no group called NoGroup, but it keeps showing up now and then, and always just 1 file...
Hm, you are sure that you dont have this NoUser/NoGroup? Because according to the documentation, you should not delete or change this user/group:

Note: group id 1 is reserved for the NoGroup group. Don't delete/change this group! http://www.inicom.net/pages/en.ioftpd-documentation.php?s=10

[EwarWoo]

Have you deleted a user part way through the race? NoUser@NoGroup shows up when the actual user is missing I think :/