diff --git a/src/pyj/session.pyj b/src/pyj/session.pyj
index e991e9639f..0e6e61d998 100644
--- a/src/pyj/session.pyj
+++ b/src/pyj/session.pyj
@@ -128,7 +128,7 @@ class UserSessionData(SessionData):
         if self.has_changes:
             ajax_send('interface-data/set-session-data', self.changes, def(end_type, xhr, ev):
                 if end_type != 'load':
-                    console.error('Failed to send session data to server: ' + xhr.error_string)
+                    console.error('Failed to send session data to server: ' + xhr.error_html)
             )
             self.changes = {}
             self.has_changes = False
diff --git a/src/pyj/srv.pyj b/src/pyj/srv.pyj
index 4ba0d79ab4..b2d7e69086 100644
--- a/src/pyj/srv.pyj
+++ b/src/pyj/srv.pyj
@@ -22,7 +22,7 @@ def on_library_loaded(end_type, xhr, ev):
         if xhr.status == 401:
             p.innerHTML = _('You are not authorized to view this site')
         else:
-            p.innerHTML = xhr.error_string
+            p.innerHTML = xhr.error_html
         document.body.appendChild(p)
 
 def on_library_load_progress(loaded, total):