diff --git a/static/latex2image-client.js b/static/latex2image-client.js
index 28fc6f4..4da37a5 100644
--- a/static/latex2image-client.js
+++ b/static/latex2image-client.js
@@ -10,7 +10,7 @@ $(document).ready(function() {
                 $('#resultCard').show();
                 $('#errorAlert').hide();
             } else {
-                $('#errorAlert').text(resultDataJSON.error);
+                $('#errorAlert').text(resultDataJSON.error || 'Invalid response received');
                 $('#errorAlert').show();
                 $('#resultCard').hide();
 
@@ -71,4 +71,4 @@ $(document).ready(function() {
         $('#latexInputTextArea').val('\\vec{F}=m \\frac{d \\vec{v}}{dt} + \\vec{v}\\frac{dm}{dt}');
         $('#convertButton').click();
     });
-});
\ No newline at end of file
+});