diff --git a/mod/scorm/classes/external.php b/mod/scorm/classes/external.php
index 39cadcf3712..38502828a25 100644
--- a/mod/scorm/classes/external.php
+++ b/mod/scorm/classes/external.php
@@ -550,15 +550,29 @@ class mod_scorm_external extends external_api {
             $params['attempt'] = scorm_get_last_attempt($scorm->id, $user->id);
         }
 
-        if ($scormtracks = scorm_get_tracks($sco->id, $user->id, $params['attempt'])) {
-            foreach ($scormtracks as $element => $value) {
-                $tracks[] = array(
-                    'element' => $element,
-                    'value' => $value,
-                );
+        $attempted = false;
+        if ($scormtracks = scorm_get_tracks($sco->id, $params['userid'], $params['attempt'])) {
+            // Check if attempted.
+            if ($scormtracks->status != '') {
+                $attempted = true;
+                foreach ($scormtracks as $element => $value) {
+                    $tracks[] = array(
+                        'element' => $element,
+                        'value' => $value,
+                    );
+                }
             }
         }
 
+        if (!$attempted) {
+            $warnings[] = array(
+                'item' => 'attempt',
+                'itemid' => $params['attempt'],
+                'warningcode' => 'notattempted',
+                'message' => get_string('notattempted', 'scorm')
+            );
+        }
+
         $result = array();
         $result['data']['attempt'] = $params['attempt'];
         $result['data']['tracks'] = $tracks;
diff --git a/mod/scorm/tests/externallib_test.php b/mod/scorm/tests/externallib_test.php
index 17baf3514d1..d034c0c1d9b 100644
--- a/mod/scorm/tests/externallib_test.php
+++ b/mod/scorm/tests/externallib_test.php
@@ -476,6 +476,7 @@ class mod_scorm_external_testcase extends externallib_advanced_testcase {
         // 7 default elements + 2 custom ones.
         $this->assertCount(9, $result['data']['tracks']);
         $this->assertEquals(1, $result['data']['attempt']);
+        $this->assertCount(0, $result['warnings']);
         // Find our tracking data.
         $found = 0;
         foreach ($result['data']['tracks'] as $userdata) {
@@ -488,6 +489,14 @@ class mod_scorm_external_testcase extends externallib_advanced_testcase {
         }
         $this->assertEquals(2, $found);
 
+        // Try invalid attempt.
+        $result = mod_scorm_external::get_scorm_sco_tracks($sco->id, $student->id, 10);
+        $result = external_api::clean_returnvalue(mod_scorm_external::get_scorm_sco_tracks_returns(), $result);
+        $this->assertCount(0, $result['data']['tracks']);
+        $this->assertEquals(10, $result['data']['attempt']);
+        $this->assertCount(1, $result['warnings']);
+        $this->assertEquals('notattempted', $result['warnings'][0]['warningcode']);
+
         // Capabilities check.
         try {
              mod_scorm_external::get_scorm_sco_tracks($sco->id, $otherstudent->id);