diff --git a/Backend/tools-services/src/main/java/com/r11/tools/controller/XQueryController.java b/Backend/tools-services/src/main/java/com/r11/tools/controller/XQueryController.java
index 72bcffe..59bec6a 100644
--- a/Backend/tools-services/src/main/java/com/r11/tools/controller/XQueryController.java
+++ b/Backend/tools-services/src/main/java/com/r11/tools/controller/XQueryController.java
@@ -49,14 +49,15 @@ public class XQueryController implements RestController {
             response.body(this.gson.toJson(responseBody));
             return;
         }
+        if (requestBody.getProcessor() == null) {
+            nonValidEngineSelectedResponse(response);
+            return;
+        }
         
         if (requestBody.getProcessor().equalsIgnoreCase("saxon"))
             process(response, requestBody, saxon);
         else
             nonValidEngineSelectedResponse(response);
-
-
-
     }
 
     private void process(Response response, XMLRequestBody requestBody, XmlEngine engine) {