diff --git a/app/ErrorAction.php b/app/ErrorAction.php
index 8fc15dc..9afca12 100644
--- a/app/ErrorAction.php
+++ b/app/ErrorAction.php
@@ -27,6 +27,12 @@ class ErrorAction extends Action
     {
         $this->template = 500;
         if ($this->exception instanceof Error404Exception) {
+            if ($this->isAjaxActionError()) {
+                if (!headers_sent()) {
+                    header('HTTP/1.0 404 Not Found');
+                    die();
+                }
+            }
             $this->template = 404;
         }
         $this->logError();
@@ -76,9 +82,24 @@ class ErrorAction extends Action
                     $error = 'Unknown Error';
                     break;
             }
-            $message = 'PHP ' . $error .  ':  ' . $ex->getMessage() . ' in ' . $ex->getFile() 
-                     . ' on line ' . $ex->getLine();
+            $message = 'PHP ' . $error . ':  ' . $ex->getMessage() . ' in ' . $ex->getFile()
+                       . ' on line ' . $ex->getLine();
             error_log($message);
         }
     }
+
+    /**
+     * Check, if exception was thrown from AjaxAction Class
+     * @return bool
+     */
+    protected function isAjaxActionError()
+    {
+        $trace = $this->exception->getTrace();
+        foreach ($trace as $line) {
+            if (isset($line['class']) && $line['class'] === 'AjaxAction') {
+                return true;
+            }
+        }
+        return false;
+    }
 }
\ No newline at end of file