diff --git a/blog/lib.php b/blog/lib.php
index 2e53d979284..b81c645c0cc 100644
--- a/blog/lib.php
+++ b/blog/lib.php
@@ -135,6 +135,25 @@ function blog_remove_associations_for_course($courseid) {
     $DB->delete_records('blog_association', array('contextid' => $context->id));
 }
 
+/**
+ * Remove module associated blogs and blog tag instances.
+ *
+ * @param  int $modcontextid Module context ID.
+ */
+function blog_remove_associations_for_module($modcontextid) {
+    global $DB;
+
+    if (!empty($assocblogids = $DB->get_fieldset_select('blog_association', 'blogid',
+        'contextid = :contextid', ['contextid' => $modcontextid]))) {
+        list($sql, $params) = $DB->get_in_or_equal($assocblogids, SQL_PARAMS_NAMED);
+
+        $DB->delete_records_select('tag_instance', "itemid $sql", $params);
+        $DB->delete_records_select('post', "id $sql AND module = :module",
+            array_merge($params, ['module' => 'blog']));
+        $DB->delete_records('blog_association', ['contextid' => $modcontextid]);
+    }
+}
+
 /**
  * Given a record in the {blog_external} table, checks the blog's URL
  * for new entries not yet copied into Moodle.
diff --git a/course/lib.php b/course/lib.php
index bf54e66c07d..aba5bdc9d54 100644
--- a/course/lib.php
+++ b/course/lib.php
@@ -1169,6 +1169,9 @@ function course_delete_module($cmid, $async = false) {
         }
     }
 
+    // Delete associated blogs and blog tag instances.
+    blog_remove_associations_for_module($modcontext->id);
+
     // Delete completion and availability data; it is better to do this even if the
     // features are not turned on, in case they were turned on previously (these will be
     // very quick on an empty table).
diff --git a/course/tests/courselib_test.php b/course/tests/courselib_test.php
index 249948d5aef..ce1850485f7 100644
--- a/course/tests/courselib_test.php
+++ b/course/tests/courselib_test.php
@@ -303,6 +303,50 @@ class core_course_courselib_testcase extends advanced_testcase {
         return $moduleinfo;
     }
 
+    /**
+     * Create module associated blog and tags.
+     *
+     * @param object $course Course.
+     * @param object $modulecontext The context of the module.
+     */
+    private function create_module_asscociated_blog($course, $modulecontext) {
+        global $DB, $CFG;
+
+        // Create default group.
+        $group = new stdClass();
+        $group->courseid = $course->id;
+        $group->name = 'Group';
+        $group->id = $DB->insert_record('groups', $group);
+
+        // Create default user.
+        $user = $this->getDataGenerator()->create_user(array(
+            'username' => 'testuser',
+            'firstname' => 'Firsname',
+            'lastname' => 'Lastname'
+        ));
+
+        // Create default post.
+        $post = new stdClass();
+        $post->userid = $user->id;
+        $post->groupid = $group->id;
+        $post->content = 'test post content text';
+        $post->module = 'blog';
+        $post->id = $DB->insert_record('post', $post);
+
+        // Create default tag.
+        $tag = $this->getDataGenerator()->create_tag(array('userid' => $user->id,
+            'rawname' => 'Testtagname', 'isstandard' => 1));
+        // Apply the tag to the blog.
+        $DB->insert_record('tag_instance', array('tagid' => $tag->id, 'itemtype' => 'user',
+            'component' => 'core', 'itemid' => $post->id, 'ordering' => 0));
+
+        require_once($CFG->dirroot . '/blog/locallib.php');
+        $blog = new blog_entry($post->id);
+        $blog->add_association($modulecontext->id);
+
+        return $blog;
+    }
+
     /**
      * Test create_module() for multiple modules defined in the $modules array (first declaration of the function).
      */
@@ -1521,6 +1565,8 @@ class core_course_courselib_testcase extends advanced_testcase {
         // Get the module context.
         $modcontext = context_module::instance($module->cmid);
 
+        $assocblog = $this->create_module_asscociated_blog($course, $modcontext);
+
         // Verify context exists.
         $this->assertInstanceOf('context_module', $modcontext);
 
@@ -1565,6 +1611,18 @@ class core_course_courselib_testcase extends advanced_testcase {
         $cmcount = $DB->count_records('course_modules', array('id' => $module->cmid));
         $this->assertEmpty($cmcount);
 
+        // Verify the blog_association record has been deleted.
+        $this->assertCount(0, $DB->get_records('blog_association',
+                array('contextid' => $modcontext->id)));
+
+        // Verify the blog post record has been deleted.
+        $this->assertCount(0, $DB->get_records('post',
+                array('id' => $assocblog->id)));
+
+        // Verify the tag instance record has been deleted.
+        $this->assertCount(0, $DB->get_records('tag_instance',
+                array('itemid' => $assocblog->id)));
+
         // Test clean up of module specific messes.
         switch ($type) {
             case 'assign':
diff --git a/lib/db/upgrade.php b/lib/db/upgrade.php
index 8fbb66aabe5..80f33f80858 100644
--- a/lib/db/upgrade.php
+++ b/lib/db/upgrade.php
@@ -2301,5 +2301,32 @@ function xmldb_main_upgrade($oldversion) {
         upgrade_main_savepoint(true, 2018073000.00);
     }
 
+    if ($oldversion < 2018083100.01) {
+        // Remove module associated blog posts for non-existent (deleted) modules.
+        $sql = "SELECT ba.contextid as modcontextid
+                  FROM {blog_association} ba
+                  JOIN {post} p
+                       ON p.id = ba.blogid
+             LEFT JOIN {context} c
+                       ON c.id = ba.contextid
+                 WHERE p.module = :module
+                       AND c.contextlevel IS NULL
+              GROUP BY ba.contextid";
+        if ($deletedmodules = $DB->get_records_sql($sql, array('module' => 'blog'))) {
+            foreach ($deletedmodules as $module) {
+                $assocblogids = $DB->get_fieldset_select('blog_association', 'blogid',
+                    'contextid = :contextid', ['contextid' => $module->modcontextid]);
+                list($sql, $params) = $DB->get_in_or_equal($assocblogids, SQL_PARAMS_NAMED);
+
+                $DB->delete_records_select('tag_instance', "itemid $sql", $params);
+                $DB->delete_records_select('post', "id $sql AND module = :module",
+                    array_merge($params, ['module' => 'blog']));
+                $DB->delete_records('blog_association', ['contextid' => $module->modcontextid]);
+            }
+        }
+        // Main savepoint reached.
+        upgrade_main_savepoint(true, 2018083100.01);
+    }
+
     return true;
 }
diff --git a/version.php b/version.php
index 6bfb0600e02..4a22036ebf1 100644
--- a/version.php
+++ b/version.php
@@ -29,7 +29,7 @@
 
 defined('MOODLE_INTERNAL') || die();
 
-$version  = 2018083100.00;              // YYYYMMDD      = weekly release date of this DEV branch.
+$version  = 2018083100.01;              // YYYYMMDD      = weekly release date of this DEV branch.
                                         //         RR    = release increments - 00 in DEV branches.
                                         //           .XX = incremental changes.