diff --git a/src/main/java/ru/soune/nocopy/entity/violation/Violation.java b/src/main/java/ru/soune/nocopy/entity/violation/Violation.java
index 803b43a..8762528 100644
--- a/src/main/java/ru/soune/nocopy/entity/violation/Violation.java
+++ b/src/main/java/ru/soune/nocopy/entity/violation/Violation.java
@@ -24,7 +24,7 @@ public class Violation {
     @Column(name = "url", nullable = false, columnDefinition = "TEXT")
     private String url;
 
-    @Column(name = "url_hash", unique = true)
+    @Column(name = "url_hash", nullable = false, unique = true)
     private String urlHash;
 
     @Column(name = "page_url")