diff --git a/src/static/dashboard.html b/src/static/dashboard.html
index 40ceb38..f40effd 100644
--- a/src/static/dashboard.html
+++ b/src/static/dashboard.html
@@ -806,7 +806,7 @@
     <div class="modal">
       <div class="modal-header">
         <h3>PDF als Quelle hochladen</h3>
-        <button class="modal-close" onclick="closeModal(modalPdfUpload)">&times;</button>
+        <button class="modal-close" onclick="closeModal(&#39;modalPdfUpload&#39;)">&times;</button>
       </div>
       <form id="pdfUploadForm" enctype="multipart/form-data">
         <div class="modal-body">
@@ -847,7 +847,7 @@
           <div id="pdfUploadProgress" class="text-secondary" style="display:none;margin-top:8px;">Lädt hoch …</div>
         </div>
         <div class="modal-footer">
-          <button type="button" class="btn btn-secondary" onclick="closeModal(modalPdfUpload)">Abbrechen</button>
+          <button type="button" class="btn btn-secondary" onclick="closeModal(&#39;modalPdfUpload&#39;)">Abbrechen</button>
           <button type="submit" class="btn btn-primary" id="pdfUploadSubmitBtn">Hochladen</button>
         </div>
       </form>