diff --git a/changedetectionio/static/js/diff-overview.js b/changedetectionio/static/js/diff-overview.js
index 8cbe7dcd..767cf6e1 100644
--- a/changedetectionio/static/js/diff-overview.js
+++ b/changedetectionio/static/js/diff-overview.js
@@ -90,5 +90,10 @@ $(document).ready(function () {
         }
     }
 
-
+    $('#diff-form').on('submit', function (e) {
+        if ($('select[name=from_version]').val() === $('select[name=to_version]').val()) {
+            e.preventDefault();
+            alert('Error - You are trying to compare the same version.');
+        }
+    });
 });
diff --git a/changedetectionio/templates/diff.html b/changedetectionio/templates/diff.html
index 6cac4605..0197bfc9 100644
--- a/changedetectionio/templates/diff.html
+++ b/changedetectionio/templates/diff.html
@@ -13,7 +13,7 @@
 <script src="{{url_for('static_content', group='js', filename='diff-overview.js')}}" defer></script>
 
 <div id="settings">
-    <form class="pure-form " action="" method="GET">
+    <form class="pure-form " action="" method="GET" id="diff-form">
         <fieldset>
             {% if versions|length >= 1 %}
                 <strong>Compare</strong>