diff --git a/plugins/kolab_files/kolab_files.js b/plugins/kolab_files/kolab_files.js
--- a/plugins/kolab_files/kolab_files.js
+++ b/plugins/kolab_files/kolab_files.js
@@ -222,8 +222,35 @@
 
   if (window.document_editor_api)
     document_editor = new document_editor_api(editor_config);
-  else
+  else if (window.manticore_api)
     document_editor = new manticore_api(editor_config);
+  else
+    document_editor = {
+      save: function() {
+        console.log('Document Editor not available');
+      },
+      export: function() {
+        console.log('Document Editor not available');
+      },
+      print: function() {
+        console.log('Document Editor not available');
+      },
+      invitation_request: function() {
+        console.log('Document Editor not available');
+      },
+      invitation_msg: function() {
+        console.log('Document Editor not available');
+      },
+      invitation_accept: function() {
+        console.log('Document Editor not available');
+      },
+      invitation_decline: function() {
+        console.log('Document Editor not available');
+      },
+      terminate: function() {
+        console.log('Document Editor not available');
+      }
+    };
 };
 
 // returns API authorization token