Use of uninitialized value in lc at FollowUpArticleTypeCheck

[subo]

Hi!
Use of uninitialized value in lc at /opt/otrs/Kernel/System/PostMaster/Filter/FollowUpArticleTypeCheck.pm line 55.

Line 54+
# check if current sender is customer (do nothing)
return 1 if lc $ArticleIndex[0]->{CustomerUserID} eq lc $Param{GetParam}->{'X-Sender'};

Nun frage ich mich, ob das ein Konfig Fehler ist, oder ein internes Problem?