diff --git a/src/main/java/ru/soune/nocopy/service/FileSimilarityService.java b/src/main/java/ru/soune/nocopy/service/FileSimilarityService.java
index b110bfc..5bb9ea5 100644
--- a/src/main/java/ru/soune/nocopy/service/FileSimilarityService.java
+++ b/src/main/java/ru/soune/nocopy/service/FileSimilarityService.java
@@ -13,6 +13,7 @@ import ru.soune.nocopy.dto.file.SimilarFileDTO;
 import ru.soune.nocopy.dto.file.SimilarityFilter;
 import ru.soune.nocopy.entity.file.FileEntity;
 import ru.soune.nocopy.entity.file.ImageHashEntity;
+import ru.soune.nocopy.exception.DuplicateImageException;
 import ru.soune.nocopy.repository.*;
 import ru.soune.nocopy.util.FileUtil;
 
@@ -146,7 +147,8 @@ public class FileSimilarityService {
 
         for (FileEntity file : fileEntityList) {
             if (calculateFileHash(file.getFilePath()).equals(hash)) {
-                return true;
+                throw new DuplicateImageException("Duplicate", file.getId(),
+                        file.getUserId());
             }
         }