diff --git a/booking.studygroups.inc b/booking.studygroups.inc
index 69031aa..cbadf94 100644
--- a/booking.studygroups.inc
+++ b/booking.studygroups.inc
@@ -947,9 +947,9 @@ function _booking_studygroups_update_preallocate($group, $group_mapping, &$sessi
 			}
 			//anyone else already assigned to this group previously
 			//this was checking equal to zero, shouldn't it be equal to 1?
-			elseif ($working_list[$person->booking_node_id]->processed == 1) {	
+			elseif ($working_list[$person->booking_node_id]->processed == 0) {	
 				//check if there is someone that should be allocated to a different group than this person
-				if (keep_separate_id > 0) {
+				if ($keep_separate_id > 0) {
 					//work out the next session to assign the other person to
 					$next_session = ($session_id % $group->booking_num_group_sessions) + 1;