diff --git a/attachments/admin.py b/attachments/admin.py
index afa789a..2d69f13 100644
--- a/attachments/admin.py
+++ b/attachments/admin.py
@@ -19,7 +19,11 @@ class AttachmentAdmin(admin.ModelAdmin):
         js = ["attachments/js/copy_url.js"]
 
     def processed_file_url(self, instance):
-        return instance.processed_file.url
+        if instance.processed_file:
+            return instance.processed_file.url
+        return ""
 
     def original_file_url(self, instance):
-        return instance.original_file.url
+        if instance.original_file:
+            return instance.original_file.url
+        return ""
diff --git a/attachments/static/attachments/js/copy_url.js b/attachments/static/attachments/js/copy_url.js
index a067f9e..0ac4097 100644
--- a/attachments/static/attachments/js/copy_url.js
+++ b/attachments/static/attachments/js/copy_url.js
@@ -9,7 +9,10 @@ $(document).ready(function() {
     const fileUrls = $('td.field-processed_file_url, td.field-original_file_url');
     for (let fileUrl of fileUrls) {
         fileUrl = $(fileUrl);
-        const existingText = fileUrl.text();
+        const existingText = fileUrl.text().trim();
+        if (!existingText) {
+            continue;
+        }
         const copyButton = `<a class='copy-button' href='#' onclick="copy(\'${existingText}\')">&#128203;</a>`;
         let innerHTML = `<span>${existingText}</span> ${copyButton}`;
         fileUrl.html(innerHTML);