diff --git a/authentication.php b/authentication.php
index 517ba71..219e098 100644
--- a/authentication.php
+++ b/authentication.php
@@ -124,7 +124,9 @@ class authentication
       // Unset the JSON Web Token as the authentication
       if ($this->route->debug)
         echo "<tt>Unset the JSON Web Token '$tokenName'</tt><br/>\n";
-      echo "<script>localStorage.removeItem('$tokenName');</script>\n";
+      if (! key_exists ("CONTENT_TYPE", $_SERVER) ||
+          $_SERVER["CONTENT_TYPE"] !== "application/json")
+        echo "<script>localStorage.removeItem('$tokenName');</script>\n";
       $algorithm = "HS256";
       $cipherKey = null;
       $cacheDir = "data/jwtCache";