diff --git a/classes/associationservice.php b/classes/associationservice.php
index 5a41422..4790aa8 100644
--- a/classes/associationservice.php
+++ b/classes/associationservice.php
@@ -480,7 +480,7 @@ class associationservice extends \external_api {
         }
 
         $sql = "SELECT DISTINCT u.* FROM {user} u INNER JOIN {local_treestudyplan_user} j ON j.user_id = u.id
-                WHERE j.studyplan_id = :studyplan_id
+                WHERE j.studyplan_id = :studyplan_id AND u.deleted != 1
                 ORDER BY u.lastname, u.firstname";
         $rs = $DB->get_recordset_sql($sql, ['studyplan_id' => $studyplanid]);
 
@@ -573,8 +573,9 @@ class associationservice extends \external_api {
                 LEFT JOIN {cohort_members}              cm ON u.id = cm.userid
                 LEFT JOIN {local_treestudyplan_cohort}  tc ON cm.cohortid = tc.cohort_id
                 LEFT JOIN {local_treestudyplan_user}    tu ON u.id = tu.user_id
-                WHERE tc.studyplan_id = :studyplanid
-                    OR tu.studyplan_id = :studyplanidtoo
+                WHERE ( tc.studyplan_id = :studyplanid
+                    OR tu.studyplan_id = :studyplanidtoo )
+                    AND u.deleted != 1
                 ORDER BY u.lastname, u.firstname";
         $rs = $DB->get_recordset_sql($sql, ["studyplanid" => $studyplan->id(), "studyplanidtoo" => $studyplan->id()]);
 
@@ -638,7 +639,7 @@ class associationservice extends \external_api {
             $sql = "SELECT DISTINCT u.id, u.username, u.firstname, u.lastname, u.idnumber, u.email
                     FROM {user} u
                     LEFT JOIN {cohort_members} cm ON u.id = cm.userid
-                    WHERE cm.cohortid = :cohortid
+                    WHERE cm.cohortid = :cohortid AND u.deleted != 1
                     ORDER BY u.lastname, u.firstname";
             $rs = $DB->get_recordset_sql($sql, ["cohortid" => $c->id]);
 
@@ -895,7 +896,7 @@ class associationservice extends \external_api {
         webservicehelper::require_capabilities(self::CAP_VIEW, $studyplan->context());
 
         $sql = "SELECT DISTINCT u.* FROM {user} u INNER JOIN {local_treestudyplan_coach} j ON j.user_id = u.id
-                WHERE j.studyplan_id = :studyplan_id
+                WHERE j.studyplan_id = :studyplan_id AND u.deleted != 1
                 ORDER BY u.lastname, u.firstname";
         $rs = $DB->get_recordset_sql($sql, ['studyplan_id' => $studyplanid]);
 
diff --git a/classes/studyplan.php b/classes/studyplan.php
index 08ccbac..437342a 100644
--- a/classes/studyplan.php
+++ b/classes/studyplan.php
@@ -671,12 +671,14 @@ class studyplan {
         $sql = "SELECT s.id FROM {local_treestudyplan} s
                 INNER JOIN {local_treestudyplan_cohort} j ON j.studyplan_id = s.id
                 INNER JOIN {cohort_members} cm ON j.cohort_id = cm.cohortid
-                WHERE cm.userid = :userid";
+                INNER JOIN {user} u ON cm.userid = user.id
+                WHERE cm.userid = :userid AND u.deleted != 1";
         $cohortplanids = $DB->get_fieldset_sql($sql, ['userid' => $userid]);
 
         $sql = "SELECT s.id FROM {local_treestudyplan} s
                 INNER JOIN {local_treestudyplan_user} j ON j.studyplan_id = s.id
-                WHERE j.user_id = :userid";
+                INNER JOIN {user} u ON j.user_id = u.id
+                WHERE j.user_id = :userid AND u.deleted != 1";
         $userplanids = $DB->get_fieldset_sql($sql, ['userid' => $userid]);
 
         $plans = [];
@@ -703,12 +705,14 @@ class studyplan {
         $sql = "SELECT COUNT(s.id) FROM {local_treestudyplan} s
                 INNER JOIN {local_treestudyplan_cohort} j ON j.studyplan_id = s.id
                 INNER JOIN {cohort_members} cm ON j.cohort_id = cm.cohortid
-                WHERE cm.userid = :userid";
+                INNER JOIN {user} u ON cm.userid = user.id
+                WHERE cm.userid = :userid  AND u.deleted != 1";
         $count += $DB->count_records_sql($sql, ['userid' => $userid]);
 
         $sql = "SELECT COUNT(s.id) FROM {local_treestudyplan} s
                 INNER JOIN {local_treestudyplan_user} j ON j.studyplan_id = s.id
-                WHERE j.user_id = :userid";
+                INNER JOIN {user} u ON j.user_id = u.id
+                WHERE j.user_id = :userid AND u.deleted != 1";
         $count += $DB->count_records_sql($sql, ['userid' => $userid]);
 
         return ($count > 0);
@@ -743,7 +747,8 @@ class studyplan {
             $uids = [];
             // First get directly linked userids.
             $sql = "SELECT j.user_id FROM {local_treestudyplan_user} j
-                    WHERE j.studyplan_id = :planid";
+                    INNER JOIN {user} u ON j.user_id = u.id
+                    WHERE j.studyplan_id = :planid  AND u.deleted != 1";
             $ulist = $DB->get_fieldset_sql($sql, ['planid' => $this->id]);
 
             $uids = array_merge($uids, $ulist);
@@ -754,7 +759,8 @@ class studyplan {
             // Next het users linked though cohort.
             $sql = "SELECT cm.userid FROM {local_treestudyplan_cohort} j
                     INNER JOIN {cohort_members} cm ON j.cohort_id = cm.cohortid
-                    WHERE j.studyplan_id = :planid";
+                    INNER JOIN {user} u ON cm.userid = user.id
+                    WHERE j.studyplan_id = :planid AND u.deleted != 1";
             $ulist = $DB->get_fieldset_sql($sql, ['planid' => $this->id]);
 
             $uids = array_merge($uids, $ulist);