fix time worked search when someone edits a value back to blank

diff --git a/httemplate/search/timeworked.html b/httemplate/search/timeworked.html
index d07cd4f..e810822 100644 (file)
--- a/httemplate/search/timeworked.html
+++ b/httemplate/search/timeworked.html
@@ -45,7 +45,9 @@ my @groupby = ();
 
 my $transactiontime = "
   CASE Transactions.Type WHEN 'Set'
-    THEN (TO_NUMBER(NewValue,'999999')-TO_NUMBER(OldValue, '999999')) * 60
+    THEN (  CASE WHEN NewValue = '' THEN 0 ELSE TO_NUMBER(NewValue,'999999') END
+           -TO_NUMBER(OldValue, '999999')
+          ) * 60
     ELSE TimeTaken*60
   END
 ";