diff --git a/blocks/rss_client/classes/privacy/provider.php b/blocks/rss_client/classes/privacy/provider.php
index cffb3c51f83..ddb512283dc 100644
--- a/blocks/rss_client/classes/privacy/provider.php
+++ b/blocks/rss_client/classes/privacy/provider.php
@@ -108,7 +108,9 @@ class provider implements \core_privacy\local\metadata\provider, \core_privacy\l
      * @param   context $context A user context.
      */
     public static function delete_data_for_all_users_in_context(\context $context) {
-        static::delete_data($context->instanceid);
+        if ($context instanceof \context_user) {
+            static::delete_data($context->instanceid);
+        }
     }
 
     /**
diff --git a/calendar/classes/privacy/provider.php b/calendar/classes/privacy/provider.php
index 3e4131f2fe1..d462084aa08 100644
--- a/calendar/classes/privacy/provider.php
+++ b/calendar/classes/privacy/provider.php
@@ -188,12 +188,14 @@ class provider implements
         }
 
         // Delete all Calendar Events in the specified context in batches.
-        $eventids = array_keys(self::get_calendar_event_ids_by_context($context));
-        self::delete_batch_records('event', 'id', $eventids);
+        if ($eventids = array_keys(self::get_calendar_event_ids_by_context($context))) {
+            self::delete_batch_records('event', 'id', $eventids);
+        }
 
         // Delete all Calendar Subscriptions in the specified context in batches.
-        $subscriptionids = array_keys(self::get_calendar_subscription_ids_by_context($context));
-        self::delete_batch_records('event_subscriptions', 'id', $subscriptionids);
+        if ($subscriptionids = array_keys(self::get_calendar_subscription_ids_by_context($context))) {
+            self::delete_batch_records('event_subscriptions', 'id', $subscriptionids);
+        }
     }
 
     /**
diff --git a/mod/assign/classes/privacy/provider.php b/mod/assign/classes/privacy/provider.php
index fe9cd0815af..94684e766f3 100644
--- a/mod/assign/classes/privacy/provider.php
+++ b/mod/assign/classes/privacy/provider.php
@@ -246,18 +246,8 @@ class provider implements metadataprovider, pluginprovider, preference_provider
         global $DB;
 
         if ($context->contextlevel == CONTEXT_MODULE) {
-            // Apparently we can't trust anything that comes via the context.
-            // Go go mega query to find out it we have an assign context that matches an existing assignment.
-            $sql = "SELECT a.id
-                    FROM {assign} a
-                    JOIN {course_modules} cm ON a.id = cm.instance
-                    JOIN {modules} m ON m.id = cm.module AND m.name = :modulename
-                    JOIN {context} ctx ON ctx.instanceid = cm.id AND ctx.contextlevel = :contextmodule
-                    WHERE ctx.id = :contextid";
-            $params = ['modulename' => 'assign', 'contextmodule' => CONTEXT_MODULE, 'contextid' => $context->id];
-            $count = $DB->get_field_sql($sql, $params);
-            // If we have a count over zero then we can proceed.
-            if ($count > 0) {
+            $cm = get_coursemodule_from_id('assign', $context->instanceid);
+            if ($cm) {
                 // Get the assignment related to this context.
                 $assign = new \assign($context, null, null);
                 // What to do first... Get sub plugins to delete their stuff.
diff --git a/mod/choice/classes/privacy/provider.php b/mod/choice/classes/privacy/provider.php
index 6b3bec89453..de4c5784cb3 100644
--- a/mod/choice/classes/privacy/provider.php
+++ b/mod/choice/classes/privacy/provider.php
@@ -182,16 +182,13 @@ class provider implements
     public static function delete_data_for_all_users_in_context(\context $context) {
         global $DB;
 
-        if (empty($context)) {
-            return;
-        }
-
         if (!$context instanceof \context_module) {
             return;
         }
 
-        $instanceid = $DB->get_field('course_modules', 'instance', ['id' => $context->instanceid], MUST_EXIST);
-        $DB->delete_records('choice_answers', ['choiceid' => $instanceid]);
+        if ($cm = get_coursemodule_from_id('choice', $context->instanceid)) {
+            $DB->delete_records('choice_answers', ['choiceid' => $cm->instance]);
+        }
     }
 
     /**
diff --git a/mod/forum/classes/privacy/provider.php b/mod/forum/classes/privacy/provider.php
index 2b3ffa9d4ca..66e99994189 100644
--- a/mod/forum/classes/privacy/provider.php
+++ b/mod/forum/classes/privacy/provider.php
@@ -754,19 +754,22 @@ class provider implements
         }
 
         // Get the course module.
-        $cm = $DB->get_record('course_modules', ['id' => $context->instanceid]);
-        $forum = $DB->get_record('forum', ['id' => $cm->instance]);
+        if (!$cm = get_coursemodule_from_id('forum', $context->instanceid)) {
+            return;
+        }
 
-        $DB->delete_records('forum_track_prefs', ['forumid' => $forum->id]);
-        $DB->delete_records('forum_subscriptions', ['forum' => $forum->id]);
-        $DB->delete_records('forum_read', ['forumid' => $forum->id]);
+        $forumid = $cm->instance;
+
+        $DB->delete_records('forum_track_prefs', ['forumid' => $forumid]);
+        $DB->delete_records('forum_subscriptions', ['forum' => $forumid]);
+        $DB->delete_records('forum_read', ['forumid' => $forumid]);
 
         // Delete all discussion items.
         $DB->delete_records_select(
             'forum_queue',
             "discussionid IN (SELECT id FROM {forum_discussions} WHERE forum = :forum)",
             [
-                'forum' => $forum->id,
+                'forum' => $forumid,
             ]
         );
 
@@ -774,12 +777,12 @@ class provider implements
             'forum_posts',
             "discussion IN (SELECT id FROM {forum_discussions} WHERE forum = :forum)",
             [
-                'forum' => $forum->id,
+                'forum' => $forumid,
             ]
         );
 
-        $DB->delete_records('forum_discussion_subs', ['forum' => $forum->id]);
-        $DB->delete_records('forum_discussions', ['forum' => $forum->id]);
+        $DB->delete_records('forum_discussion_subs', ['forum' => $forumid]);
+        $DB->delete_records('forum_discussions', ['forum' => $forumid]);
 
         // Delete all files from the posts.
         $fs = get_file_storage();
diff --git a/mod/glossary/classes/privacy/provider.php b/mod/glossary/classes/privacy/provider.php
index 0d43966c563..b4fbfa17e75 100644
--- a/mod/glossary/classes/privacy/provider.php
+++ b/mod/glossary/classes/privacy/provider.php
@@ -248,39 +248,36 @@ class provider implements
             return;
         }
 
-        $instanceid = $DB->get_field('course_modules', 'instance', ['id' => $context->instanceid], MUST_EXIST);
-        $DB->record_exists('glossary', ['id' => $context->instanceid]);
-        $DB->delete_records('glossary_entries', ['glossaryid' => $instanceid]);
-
-        if ($context->contextlevel == CONTEXT_MODULE) {
-            $instanceid = $DB->get_field('course_modules', 'instance', ['id' => $context->instanceid], MUST_EXIST);
-            $DB->record_exists('glossary', ['id' => $context->instanceid]);
-
-            $entries = $DB->get_records('glossary_entries', ['glossaryid' => $instanceid]);
-            foreach ($entries as $entry) {
-                // Delete related entry categories.
-                $DB->delete_records('glossary_entries_categories', ['entryid' => $entry->id]);
-
-                // Delete related entry aliases.
-                $DB->delete_records('glossary_alias', ['entryid' => $entry->id]);
-            }
-
-            // Delete entry and attachment files.
-            get_file_storage()->delete_area_files($context->id, 'mod_glossary', 'entry');
-            get_file_storage()->delete_area_files($context->id, 'mod_glossary', 'attachment');
-
-            // Delete related ratings.
-            \core_rating\privacy\provider::delete_ratings($context, 'mod_glossary', 'entry');
-
-            // Delete comments.
-            \core_comment\privacy\provider::delete_comments_for_all_users($context, 'mod_glossary', 'glossary_entry');
-
-            // Delete tags.
-            \core_tag\privacy\provider::delete_item_tags($context, 'mod_glossary', 'glossary_entries');
-
-            // Now delete all user related entries.
-            $DB->delete_records('glossary_entries', ['glossaryid' => $instanceid]);
+        if (!$cm = get_coursemodule_from_id('glossary', $context->instanceid)) {
+            return;
         }
+
+        $instanceid = $cm->instance;
+
+        $entries = $DB->get_records('glossary_entries', ['glossaryid' => $instanceid]);
+        foreach ($entries as $entry) {
+            // Delete related entry categories.
+            $DB->delete_records('glossary_entries_categories', ['entryid' => $entry->id]);
+
+            // Delete related entry aliases.
+            $DB->delete_records('glossary_alias', ['entryid' => $entry->id]);
+        }
+
+        // Delete entry and attachment files.
+        get_file_storage()->delete_area_files($context->id, 'mod_glossary', 'entry');
+        get_file_storage()->delete_area_files($context->id, 'mod_glossary', 'attachment');
+
+        // Delete related ratings.
+        \core_rating\privacy\provider::delete_ratings($context, 'mod_glossary', 'entry');
+
+        // Delete comments.
+        \core_comment\privacy\provider::delete_comments_for_all_users($context, 'mod_glossary', 'glossary_entry');
+
+        // Delete tags.
+        \core_tag\privacy\provider::delete_item_tags($context, 'mod_glossary', 'glossary_entries');
+
+        // Now delete all user related entries.
+        $DB->delete_records('glossary_entries', ['glossaryid' => $instanceid]);
     }
 
     /**
@@ -300,7 +297,6 @@ class provider implements
             if ($context->contextlevel == CONTEXT_MODULE) {
 
                 $instanceid = $DB->get_field('course_modules', 'instance', ['id' => $context->instanceid], MUST_EXIST);
-                $DB->record_exists('glossary', ['id' => $context->instanceid]);
 
                 $entries = $DB->get_records('glossary_entries', ['glossaryid' => $instanceid, 'userid' => $userid]);
                 foreach ($entries as $entry) {
diff --git a/mod/lesson/classes/privacy/provider.php b/mod/lesson/classes/privacy/provider.php
index 35d239573a8..78c48eb88ea 100644
--- a/mod/lesson/classes/privacy/provider.php
+++ b/mod/lesson/classes/privacy/provider.php
@@ -382,7 +382,9 @@ class provider implements
             return;
         }
 
-        $lessonid = static::get_lesson_id_from_context($context);
+        if (!$lessonid = static::get_lesson_id_from_context($context)) {
+            return;
+        }
 
         $DB->delete_records('lesson_attempts', ['lessonid' => $lessonid]);
         $DB->delete_records('lesson_branch', ['lessonid' => $lessonid]);
diff --git a/mod/lti/classes/privacy/provider.php b/mod/lti/classes/privacy/provider.php
index f0339813317..716ca9d0f30 100644
--- a/mod/lti/classes/privacy/provider.php
+++ b/mod/lti/classes/privacy/provider.php
@@ -163,8 +163,9 @@ class provider implements
             return;
         }
 
-        $instanceid = $DB->get_field('course_modules', 'instance', ['id' => $context->instanceid], MUST_EXIST);
-        $DB->delete_records('lti_submission', ['ltiid' => $instanceid]);
+        if ($cm = get_coursemodule_from_id('lti', $context->instanceid)) {
+            $DB->delete_records('lti_submission', ['ltiid' => key($ltiidstocmids)]);
+        }
     }
 
     /**
diff --git a/mod/survey/classes/privacy/provider.php b/mod/survey/classes/privacy/provider.php
index b790c8c7331..64d20649c43 100644
--- a/mod/survey/classes/privacy/provider.php
+++ b/mod/survey/classes/privacy/provider.php
@@ -229,9 +229,10 @@ class provider implements
             return;
         }
 
-        $surveyid = static::get_survey_id_from_context($context);
-        $DB->delete_records('survey_answers', ['survey' => $surveyid]);
-        $DB->delete_records('survey_analysis', ['survey' => $surveyid]);
+        if ($surveyid = static::get_survey_id_from_context($context)) {
+            $DB->delete_records('survey_answers', ['survey' => $surveyid]);
+            $DB->delete_records('survey_analysis', ['survey' => $surveyid]);
+        }
     }
 
     /**
diff --git a/notes/classes/privacy/provider.php b/notes/classes/privacy/provider.php
index 027ef056fa4..b9de0c901fd 100644
--- a/notes/classes/privacy/provider.php
+++ b/notes/classes/privacy/provider.php
@@ -184,7 +184,7 @@ class provider implements \core_privacy\local\metadata\provider, \core_privacy\l
     public static function delete_data_for_all_users_in_context(\context $context) {
         global $DB;
 
-        if (empty($context)) {
+        if ($context->contextlevel != CONTEXT_COURSE) {
             return;
         }