diff --git a/Koha/Patron.pm b/Koha/Patron.pm
index 420b576058..4ad3124a6a 100644
--- a/Koha/Patron.pm
+++ b/Koha/Patron.pm
@@ -294,7 +294,10 @@ sub store {
 
                 my $borrowers_log = C4::Context->preference("BorrowersLog");
                 my $previous_cardnumber = $self->get_from_storage->cardnumber;
-                if ( $borrowers_log && $previous_cardnumber ne $self->cardnumber )
+                if ($borrowers_log
+                    && ( !defined $previous_cardnumber
+                        || $previous_cardnumber ne $self->cardnumber )
+                    )
                 {
                     logaction(
                         "MEMBERS",