diff --git a/app/scodoc/html_sco_header.py b/app/scodoc/html_sco_header.py
index 5d42e3d9..c46dd3ac 100644
--- a/app/scodoc/html_sco_header.py
+++ b/app/scodoc/html_sco_header.py
@@ -100,7 +100,14 @@ _HTML_BEGIN = f"""<!DOCTYPE html>
 <script src="{scu.STATIC_DIR}/libjs/menu.js"></script>
 <script src="{scu.STATIC_DIR}/libjs/bubble.js"></script>
 <script>
- window.onload=function(){{enableTooltips("gtrcontent"); enableTooltips("sidebar");}};
+ window.onload=function(){{
+     if (document.getElementById('gtrcontent')) {{
+        enableTooltips("gtrcontent");
+     }}
+     if (document.getElementById('sidebar')) {{
+        enableTooltips("sidebar");
+     }}
+ }};
 </script>
 
 <script src="{scu.STATIC_DIR}/jQuery/jquery.js"></script>
@@ -217,8 +224,14 @@ def sco_header(
 <script src="{scu.STATIC_DIR}/libjs/menu.js"></script>
 <script src="{scu.STATIC_DIR}/libjs/bubble.js"></script>
 <script>
- window.onload=function(){{enableTooltips("gtrcontent"); enableTooltips("sidebar");}};
-
+ window.onload=function(){{
+     if (document.getElementById('gtrcontent')) {{
+        enableTooltips("gtrcontent");
+     }}
+     if (document.getElementById('sidebar')) {{
+        enableTooltips("sidebar");
+     }}
+ }};
  const SCO_URL="{url_for("scolar.index_html", scodoc_dept=g.scodoc_dept)}";
  const SCO_TIMEZONE="{scu.TIME_ZONE}";
 </script>"""
diff --git a/app/templates/sco_page.j2 b/app/templates/sco_page.j2
index 53883f74..26e035ec 100644
--- a/app/templates/sco_page.j2
+++ b/app/templates/sco_page.j2
@@ -49,8 +49,14 @@
 <script src="{{scu.STATIC_DIR}}/js/scodoc.js"></script>
 <script src="{{scu.STATIC_DIR}}/DataTables/datatables.min.js"></script>
 <script>
-    window.onload = function () { enableTooltips("gtrcontent"); enableTooltips("sidebar"); };
-
+    window.onload = function () {
+        if (document.getElementById('gtrcontent')) {
+            enableTooltips("gtrcontent");
+        }
+        if (document.getElementById('sidebar')) {
+            enableTooltips("sidebar");
+        }
+    };
     const SCO_URL = "{{ url_for('scolar.index_html', scodoc_dept=g.scodoc_dept) }}";
 </script>
 
