diff --git a/www/addons/mod/lesson/lang/en.json b/www/addons/mod/lesson/lang/en.json
index 903667efb1a..a85e9edbe81 100644
--- a/www/addons/mod/lesson/lang/en.json
+++ b/www/addons/mod/lesson/lang/en.json
@@ -21,6 +21,7 @@
     "emptypassword": "Password cannot be empty",
     "enterpassword": "Please enter the password:",
     "eolstudentoutoftimenoanswers": "You did not answer any questions.  You have received a 0 for this lesson.",
+    "errorprefetchrandombranch": "This lesson contains a jump to a random content page, it cannot be attempted in the app until it has been started in web.",
     "errorreviewretakenotlast": "This attempt can no longer be reviewed because another attempt has been finished.",
     "finish": "Finish",
     "finishretakeoffline": "This attempt was finished offline.",
diff --git a/www/addons/mod/lesson/services/handlers.js b/www/addons/mod/lesson/services/handlers.js
index cf3e3fadb5b..f1308aa0422 100644
--- a/www/addons/mod/lesson/services/handlers.js
+++ b/www/addons/mod/lesson/services/handlers.js
@@ -98,9 +98,9 @@ angular.module('mm.addons.mod_lesson')
 
                     $mmaModLessonPrefetchHandler.getDownloadSize(module, courseId).then(function(size) {
                         $mmUtil.confirmDownloadSize(size).then(function() {
-                            $mmaModLessonPrefetchHandler.prefetch(module, courseId).catch(function() {
+                            $mmaModLessonPrefetchHandler.prefetch(module, courseId).catch(function(error) {
                                 if (!$scope.$$destroyed) {
-                                    $mmUtil.showErrorModal('mm.core.errordownloading', true);
+                                    $mmUtil.showErrorModalDefault(error, 'mm.core.errordownloading', true);
                                 }
                             });
                         }).catch(function() {
diff --git a/www/addons/mod/lesson/services/lesson.js b/www/addons/mod/lesson/services/lesson.js
index 29e784c81da..7dbebba49c4 100644
--- a/www/addons/mod/lesson/services/lesson.js
+++ b/www/addons/mod/lesson/services/lesson.js
@@ -64,6 +64,8 @@ angular.module('mm.addons.mod_lesson')
     self.LESSON_UNSEENBRANCHPAGE = -50;
     // Jump to a random page within a branch and end of branch or end of lesson.
     self.LESSON_RANDOMPAGE = -60;
+    // Jump to a random Branch.
+    self.LESSON_RANDOMBRANCH = -70;
     // Cluster Jump.
     self.LESSON_CLUSTERJUMP = -80;
 
diff --git a/www/addons/mod/lesson/services/prefetch_handler.js b/www/addons/mod/lesson/services/prefetch_handler.js
index 38df02df9bb..7b58cdf68aa 100644
--- a/www/addons/mod/lesson/services/prefetch_handler.js
+++ b/www/addons/mod/lesson/services/prefetch_handler.js
@@ -22,7 +22,7 @@ angular.module('mm.addons.mod_lesson')
  * @name $mmaModLessonPrefetchHandler
  */
 .factory('$mmaModLessonPrefetchHandler', function($mmaModLesson, $q, $mmPrefetchFactory, mmaModLessonComponent, $mmUtil, $mmGroups,
-    $mmSite, $mmFilepool, $rootScope, $timeout, $ionicModal, mmCoreDontShowError, $mmCourse) {
+    $mmSite, $mmFilepool, $rootScope, $timeout, $ionicModal, mmCoreDontShowError, $mmCourse, $mmLang) {
 
     var self = $mmPrefetchFactory.createPrefetchHandler(mmaModLessonComponent, false);
 
@@ -426,10 +426,19 @@ angular.module('mm.addons.mod_lesson')
 
             // Get the list of pages.
             promises.push($mmaModLesson.getPages(lesson.id, password, false, true, siteId).then(function(pages) {
-                var subPromises = [];
+                var subPromises = [],
+                    hasRandomBranch = false;
 
                 // Get the data for each page.
                 angular.forEach(pages, function(data) {
+                    // Check if any page has a RANDOMBRANCH jump.
+                    angular.forEach(data.jumps, function(jump) {
+                        if (jump == $mmaModLesson.LESSON_RANDOMBRANCH) {
+                            hasRandomBranch = true;
+                        }
+                    });
+
+                    // Get the page data.
                     subPromises.push($mmaModLesson.getPageData(lesson, data.page.id, password, false, true, false,
                             true, undefined, undefined, siteId).then(function(pageData) {
 
@@ -449,6 +458,16 @@ angular.module('mm.addons.mod_lesson')
                     }));
                 });
 
+                // Prefetch the list of possible jumps for offline navigation. Do it here so we know hasRandomBranch.
+                subPromises.push($mmaModLesson.getPagesPossibleJumps(lesson.id, false, true, siteId).catch(function(error) {
+                    if (hasRandomBranch) {
+                        // The WebSevice probably failed because RANDOMBRANCH aren't supported if the user hasn't seen any page.
+                        return $mmLang.translateAndReject('mma.mod_lesson.errorprefetchrandombranch');
+                    } else {
+                        return $q.reject(error);
+                    }
+                }));
+
                 return $q.all(subPromises);
             }));
 
@@ -457,8 +476,6 @@ angular.module('mm.addons.mod_lesson')
                 // Ignore errors.
             }));
 
-            // Prefetch the list of possible jumps for offline navigation.
-            promises.push($mmaModLesson.getPagesPossibleJumps(lesson.id, false, true, siteId));
 
             // Prefetch viewed pages in last retake to calculate progress.
             promises.push($mmaModLesson.getContentPagesViewedOnline(lesson.id, retake, false, true, siteId));