Index: bp-groups/bp-groups-template.php
===================================================================
--- bp-groups/bp-groups-template.php	(revision 7607)
+++ bp-groups/bp-groups-template.php	(working copy)
@@ -1782,7 +1782,7 @@
 
 					// Member has outstanding invitation -
 					// show an "Accept Invitation" button
-					if ( $group->is_invited ) {
+					if ( isset( $group->is_invited ) && $group->is_invited ) {
 						$button = array(
 							'id'                => 'accept_invite',
 							'component'         => 'groups',
@@ -1798,7 +1798,7 @@
 
 					// Member has requested membership but request is pending -
 					// show a "Request Sent" button
-					} elseif ( $group->is_pending ) {
+					} elseif ( isset( $group->is_pending ) && $group->is_pending ) {
 						$button = array(
 							'id'                => 'membership_requested',
 							'component'         => 'groups',