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-rw-r--r--fs_selfservice/FS-SelfService/cgi/view_usage_details.html4
1 files changed, 3 insertions, 1 deletions
diff --git a/fs_selfservice/FS-SelfService/cgi/view_usage_details.html b/fs_selfservice/FS-SelfService/cgi/view_usage_details.html
index 0388c2fad..27afe12a7 100644
--- a/fs_selfservice/FS-SelfService/cgi/view_usage_details.html
+++ b/fs_selfservice/FS-SelfService/cgi/view_usage_details.html
@@ -47,7 +47,9 @@
$OUT .= '</TD><TD ALIGN="right">';
$OUT .= Date::Format::time2str('%T%P %a&nbsp;%b&nbsp;%o&nbsp;%Y', $usage->{'acctstarttime'});
$OUT .= '</TD><TD ALIGN="right">';
- my $duration = $usage->{'acctstoptime'} - $usage->{'acctstarttime'};
+ my $duration = ( $usage->{'acctstoptime'} && $usage->{'acctstarttime'} )
+ ? ( $usage->{'acctstoptime'} - $usage->{'acctstarttime'} )
+ : 0;
$total += $duration;
my $h = int($duration/3600);
my $m = sprintf("%02d", int(($duration % 3600) / 60));