diff --git a/src/main/java/ru/ulstu/paper/controller/PaperController.java b/src/main/java/ru/ulstu/paper/controller/PaperController.java
index f6438ab..36d72fe 100644
--- a/src/main/java/ru/ulstu/paper/controller/PaperController.java
+++ b/src/main/java/ru/ulstu/paper/controller/PaperController.java
@@ -56,8 +56,11 @@ public class PaperController {
     }
 
     @PostMapping(value = "/paper", params = "addDeadline")
-    public String addDeadline(@Valid PaperDto paperDto) {
+    public String addDeadline(@Valid PaperDto paperDto, Errors errors) {
         filterEmptyDeadlines(paperDto);
+        if (errors.hasErrors()) {
+            return "/papers/paper";
+        }
         paperDto.getDeadlines().add(new DeadlineDto());
         return "/papers/paper";
     }