diff --git a/bridges/Arte7Bridge.php b/bridges/Arte7Bridge.php
index 239fc6ad..5898e881 100644
--- a/bridges/Arte7Bridge.php
+++ b/bridges/Arte7Bridge.php
@@ -156,6 +156,10 @@ class Arte7Bridge extends BridgeAbstract
             . $element['mainImage']['url']
             . '" /></a>';
 
+            $item['itunes'] = [
+                'duration' => $durationSeconds,
+            ];
+
             $this->items[] = $item;
         }
     }
diff --git a/formats/AtomFormat.php b/formats/AtomFormat.php
index d59e42fe..07ca7272 100644
--- a/formats/AtomFormat.php
+++ b/formats/AtomFormat.php
@@ -147,11 +147,13 @@ class AtomFormat extends FormatAbstract
                     $entry->appendChild($itunesProperty);
                     $itunesProperty->appendChild($document->createTextNode($itunesValue));
                 }
-                $itunesEnclosure = $document->createElement('enclosure');
-                $entry->appendChild($itunesEnclosure);
-                $itunesEnclosure->setAttribute('url', $itemArray['enclosure']['url']);
-                $itunesEnclosure->setAttribute('length', $itemArray['enclosure']['length']);
-                $itunesEnclosure->setAttribute('type', $itemArray['enclosure']['type']);
+                if (isset($itemArray['enclosure'])) {
+                    $itunesEnclosure = $document->createElement('enclosure');
+                    $entry->appendChild($itunesEnclosure);
+                    $itunesEnclosure->setAttribute('url', $itemArray['enclosure']['url']);
+                    $itunesEnclosure->setAttribute('length', $itemArray['enclosure']['length']);
+                    $itunesEnclosure->setAttribute('type', $itemArray['enclosure']['type']);
+                }
             } elseif (!empty($entryUri)) {
                 $entryLinkAlternate = $document->createElement('link');
                 $entry->appendChild($entryLinkAlternate);
diff --git a/formats/MrssFormat.php b/formats/MrssFormat.php
index 4fd06439..5b96a6a7 100644
--- a/formats/MrssFormat.php
+++ b/formats/MrssFormat.php
@@ -135,11 +135,13 @@ class MrssFormat extends FormatAbstract
                     $entry->appendChild($itunesProperty);
                     $itunesProperty->appendChild($document->createTextNode($itunesValue));
                 }
-                $itunesEnclosure = $document->createElement('enclosure');
-                $entry->appendChild($itunesEnclosure);
-                $itunesEnclosure->setAttribute('url', $itemArray['enclosure']['url']);
-                $itunesEnclosure->setAttribute('length', $itemArray['enclosure']['length']);
-                $itunesEnclosure->setAttribute('type', $itemArray['enclosure']['type']);
+                if (isset($itemArray['enclosure'])) {
+                    $itunesEnclosure = $document->createElement('enclosure');
+                    $entry->appendChild($itunesEnclosure);
+                    $itunesEnclosure->setAttribute('url', $itemArray['enclosure']['url']);
+                    $itunesEnclosure->setAttribute('length', $itemArray['enclosure']['length']);
+                    $itunesEnclosure->setAttribute('type', $itemArray['enclosure']['type']);
+                }
             } if (!empty($itemUri)) {
                 $entryLink = $document->createElement('link');
                 $entry->appendChild($entryLink);