diff --git a/Classes/Common/DocumentAnnotation.php b/Classes/Common/DocumentAnnotation.php
index d3b743abc..a3bcecb7f 100644
--- a/Classes/Common/DocumentAnnotation.php
+++ b/Classes/Common/DocumentAnnotation.php
@@ -12,6 +12,7 @@
  * LICENSE.txt file that was distributed with this source code.
  */
 
+use DateTime;
 use Kitodo\Dlf\Domain\Model\Annotation;
 use Kitodo\Dlf\Domain\Model\Document;
 use TYPO3\CMS\Core\Configuration\ExtensionConfiguration;
@@ -279,10 +280,10 @@ protected function getAudioPagesByFileId($fileId, $range = null) {
             }
 
             foreach ($tracks as $index => $track) {
-                $begin = new \DateTime("1970-01-01 " . $track['begin']);
-                $extent = new \DateTime("1970-01-01 " . $track['extent']);
-                $diff = (new \DateTime("1970-01-01 00:00:00"))->diff($extent);
-                $end = (new \DateTime("1970-01-01 " . $track['begin']))->add($diff);
+                $begin = new DateTime("1970-01-01 " . $track['begin']);
+                $extent = new DateTime("1970-01-01 " . $track['extent']);
+                $diff = (new DateTime("1970-01-01 00:00:00"))->diff($extent);
+                $end = (new DateTime("1970-01-01 " . $track['begin']))->add($diff);
 
                 if (
                     !(
diff --git a/Classes/Controller/PageViewController.php b/Classes/Controller/PageViewController.php
index 83ab794c2..6938ad458 100644
--- a/Classes/Controller/PageViewController.php
+++ b/Classes/Controller/PageViewController.php
@@ -186,25 +186,37 @@ protected function multipageNavigation() {
                     MathUtility::forceIntegerInRange((int) $this->requestData['docPage'][$i] - 1, 1, $document->numPages, 1)
             ];
 
-            $navigateAllPageNext = array_merge($navigateAllPageNext, [
-                'tx_dlf[docPage]['.$i.']' =>
-                    MathUtility::forceIntegerInRange((int) $this->requestData['docPage'][$i] + 1, 1, $document->numPages, 1)
-            ]);
+            $navigateAllPageNext = array_merge(
+                $navigateAllPageNext,
+                [
+                    'tx_dlf[docPage][' . $i . ']' =>
+                        MathUtility::forceIntegerInRange((int) $this->requestData['docPage'][$i] + 1, 1, $document->numPages, 1)
+                ]
+            );
 
-            $navigateAllPagePrev = array_merge($navigateAllPagePrev, [
-                'tx_dlf[docPage]['.$i.']' =>
-                    MathUtility::forceIntegerInRange((int) $this->requestData['docPage'][$i] - 1, 1, $document->numPages, 1)
-            ]);
+            $navigateAllPagePrev = array_merge(
+                $navigateAllPagePrev,
+                [
+                    'tx_dlf[docPage][' . $i . ']' =>
+                        MathUtility::forceIntegerInRange((int) $this->requestData['docPage'][$i] - 1, 1, $document->numPages, 1)
+                ]
+            );
 
-            $navigateAllMeasureNext = array_merge($navigateAllMeasureNext, [
-                'tx_dlf[docMeasure]['.$i.']' =>
-                    MathUtility::forceIntegerInRange((int) $this->requestData['docMeasure'][$i] + 1, 1, $document->numMeasures, 1)
-            ]);
+            $navigateAllMeasureNext = array_merge(
+                $navigateAllMeasureNext,
+                [
+                    'tx_dlf[docMeasure][' . $i . ']' =>
+                        MathUtility::forceIntegerInRange((int) $this->requestData['docMeasure'][$i] + 1, 1, $document->numMeasures, 1)
+                ]
+            );
 
-            $navigateAllMeasurePrev = array_merge($navigateAllMeasurePrev, [
-                'tx_dlf[docMeasure]['.$i.']' =>
-                    MathUtility::forceIntegerInRange((int) $this->requestData['docMeasure'][$i] - 1, 1, $document->numMeasures, 1)
-            ]);
+            $navigateAllMeasurePrev = array_merge(
+                $navigateAllMeasurePrev,
+                [
+                    'tx_dlf[docMeasure][' . $i . ']' =>
+                        MathUtility::forceIntegerInRange((int) $this->requestData['docMeasure'][$i] - 1, 1, $document->numMeasures, 1)
+                ]
+            );
 
             if ($document->numMeasures > 0) {
                 $navigationMeasureArray[$i]['next'] = [
@@ -241,7 +253,8 @@ protected function multipageNavigation() {
      * @param $page
      * @return false|int|mixed|string|null
      */
-    public function convertMeasureOrPage($document, $measure = null, $page = null) {
+    public function convertMeasureOrPage($document, $measure = null, $page = null)
+    {
         $return = null;
         $measure2Page = array_column($document->musicalStructure, 'page');
         if ($measure) {
@@ -266,7 +279,7 @@ public function addDocumentAction(FormAddDocument $formAddDocument)
             }
             $params = array_merge(
                 ['tx_dlf' => $this->requestData],
-                ['tx_dlf[multipleSource]['.$nextMultipleSourceKey.']' => $formAddDocument->getLocation()],
+                ['tx_dlf[multipleSource][' . $nextMultipleSourceKey . ']' => $formAddDocument->getLocation()],
                 ['tx_dlf[multiview]' => 1]
             );
             $uriBuilder = $this->uriBuilder;
@@ -297,7 +310,8 @@ protected function getMeasures(int $page, $specificDoc = null, $docNumber = null
         $measureCoordsFromCurrentSite = [];
         $measureCounterToMeasureId = [];
         $measureLinks = [];
-        if ($defaultFileId = $doc->physicalStructureInfo[$currentPhysId]['files']['DEFAULT']) {
+        $defaultFileId = $doc->physicalStructureInfo[$currentPhysId]['files']['DEFAULT'];
+        if (isset($defaultFileId)) {
             $musicalStruct = $doc->musicalStructureInfo;
 
             $i = 0;
diff --git a/Resources/Public/JavaScript/PageView/PageView.js b/Resources/Public/JavaScript/PageView/PageView.js
index 041de7cf7..313a19391 100644
--- a/Resources/Public/JavaScript/PageView/PageView.js
+++ b/Resources/Public/JavaScript/PageView/PageView.js
@@ -229,7 +229,7 @@ var dlfViewer = function(settings){
      * @type {Object}
      * @public
      */
-     this.tk = null
+     this.tk = null;
 
     /**
      * @type {Boolean|false}
@@ -344,7 +344,6 @@ dlfViewer.prototype.countPages = function () {
 dlfViewer.prototype.addCustomControls = function() {
     var fulltextControl = undefined,
         fulltextDownloadControl = undefined,
-		scoreControl = undefined,
         annotationControl = undefined,
         imageManipulationControl = undefined,
         images = this.images;
@@ -423,7 +422,7 @@ dlfViewer.prototype.addCustomControls = function() {
             });
         });
 
-        let selected = null
+        let selected = null;
         map.on('pointermove', function (e) {
             if (selected !== null) {
                 $('[data-annotation-id="'+selected.getId()+'"]').removeClass('hover')
@@ -919,7 +918,7 @@ dlfViewer.prototype.init = function(controlNames) {
 
 dlfViewer.prototype.updateLayerSize = function() {
   this.map.updateSize();
-}
+};
 
 /**
  * Generate the OpenLayers layer objects for given image sources. Returns a promise / jQuery deferred object.
diff --git a/ext_localconf.php b/ext_localconf.php
index c28e897ab..37f78054e 100644
--- a/ext_localconf.php
+++ b/ext_localconf.php
@@ -219,7 +219,8 @@
     'Dlf',
     'PageView',
     [
-        \Kitodo\Dlf\Controller\PageViewController::class => 'main, addDocument',
+        \Kitodo\Dlf\Controller\PageViewController::class => 'main',
+        \Kitodo\Dlf\Controller\PageViewController::class => 'addDocument',
     ],
     // non-cacheable actions
     [