- $acctstoptime = "( $acctstoptime ) OR " if $acctstoptime;
- $acctstoptime .= 'AcctStopTime IS NULL';
+ if ( $acctstoptime ) {
+ $acctstoptime = "( ( $acctstoptime ) OR AcctStopTime IS NULL )";
+ } else {
+ $acctstoptime = 'AcctStopTime IS NULL';
+ }