diff --git a/ftb/src/main/java/ftb/test/controller/CultureClockInController.java b/ftb/src/main/java/ftb/test/controller/CultureClockInController.java
index 153ee0d..7df8a5d 100644
--- a/ftb/src/main/java/ftb/test/controller/CultureClockInController.java
+++ b/ftb/src/main/java/ftb/test/controller/CultureClockInController.java
@@ -46,7 +46,7 @@ public class CultureClockInController {
      * @param response HttpServletResponse
      */
     @GetMapping(value = "/random-preview")
-    public void getRandomPicPreview(@RequestParam(value = "lastCombo", required = false) String lastCombo, HttpServletRequest request, HttpServletResponse response) throws Exception {
+    public void getRandomPicPreview(@RequestParam(value = "lastCombo", required = true) String lastCombo1, HttpServletRequest request, HttpServletResponse response) throws Exception {
 
         MutablePair<String, BufferedImage> pair = cultureClockInService.getRandomPicPreview(lastCombo, requestUrl);
         if (pair == null || pair.getRight() == null) {