diff --git a/src/opnsense/mvc/app/controllers/OPNsense/Base/ApiControllerBase.php b/src/opnsense/mvc/app/controllers/OPNsense/Base/ApiControllerBase.php
index b9cfbb675..19126ab1a 100644
--- a/src/opnsense/mvc/app/controllers/OPNsense/Base/ApiControllerBase.php
+++ b/src/opnsense/mvc/app/controllers/OPNsense/Base/ApiControllerBase.php
@@ -59,13 +59,29 @@ class ApiControllerBase extends ControllerRoot
 
     /**
      * Raise errors, warnings, notices, etc.
-     * @param $errno
-     * @param $errstr
+     * @param $errno The first parameter, errno, contains the level of the
+     *               error raised, as an integer.
+     * @param $errstr The second parameter, errstr, contains the error
+     *                message, as a string.
+     * @param $errfile The third parameter is optional, errfile, which
+     *                 contains the filename that the error was raised in, as
+     *                 a string.
+     * @param $errline The fourth parameter is optional, errline, which
+     *                 contains the line number the error was raised at, as an
+     *                 integer.
+     * @param $errcontext The fifth parameter is optional, errcontext, which
+     *                    is an array that points to the active symbol table
+     *                    at the point the error occurred. In other words,
+     *                    errcontext will contain an array of every variable
+     *                    that existed in the scope the error was triggered
+     *                    in. User error handler must not modify error
+     *                    context.
      * @throws \Exception
      */
-    public function APIErrorHandler($errno, $errstr)
+    public function APIErrorHandler($errno, $errstr, $errfile, $errline, $errcontext)
     {
-        throw new \Exception($errstr . ' ['.$errno.']');
+        $msg = "Error at $errfile:$errline - $errstr (errno=$errno)";
+        throw new \Exception($msg);
     }
 
     /**
diff --git a/src/opnsense/www/api.php b/src/opnsense/www/api.php
index b0b7deca2..07641cfe8 100644
--- a/src/opnsense/www/api.php
+++ b/src/opnsense/www/api.php
@@ -29,6 +29,6 @@ try {
     $response = array();
     $response['errorMessage'] = $e->getMessage();
     header("Content-Type: application/json;charset=utf-8");
-    echo htmlspecialchars(json_encode($response), ENT_NOQUOTES);
+    echo json_encode($response, JSON_UNESCAPED_SLASHES);
     error_log($e);
 }