sg-report-flight: avoid an undefined ref

diff --git a/sg-report-flight b/sg-report-flight
index 92f7551825a426940b2014e388c7c5a9ee52983b..69ef252014fbab773fabf76ed97de849f6ee77e8 100755 (executable)
--- a/sg-report-flight
+++ b/sg-report-flight
@@ -812,8 +812,12 @@ END
             encode_entities(strftime "%Y-%m-%d %H:%M:%S Z",
                             gmtime $step->{started});
 
-        printf H "<td align=right>%d</td>\n",
-            $step->{finished} - $step->{started};
+       if (defined $step->{finished} && defined $step->{started}) {
+           printf H "<td align=right>%d</td>\n",
+                $step->{finished} - $step->{started};
+       } else {
+           printf H "<td></td>\n";
+       }
     }
 
     print H <<END;