diff --git a/backend/model/sql/enitites/DirectoryEntity.ts b/backend/model/sql/enitites/DirectoryEntity.ts
index d8e1171..3ccbe38 100644
--- a/backend/model/sql/enitites/DirectoryEntity.ts
+++ b/backend/model/sql/enitites/DirectoryEntity.ts
@@ -36,7 +36,7 @@ export class DirectoryEntity implements DirectoryDTO {
    */
   @Column({
     type: 'bigint', nullable: true, unsigned: true, transformer: {
-      from: v => parseInt(v, 10),
+      from: v => parseInt(v, 10) || null,
       to: v => v
     }
   })
diff --git a/backend/model/sql/enitites/VideoEntity.ts b/backend/model/sql/enitites/VideoEntity.ts
index 3c9d046..f7a0156 100644
--- a/backend/model/sql/enitites/VideoEntity.ts
+++ b/backend/model/sql/enitites/VideoEntity.ts
@@ -1,5 +1,5 @@
-import {Column, Entity, ChildEntity} from 'typeorm';
-import { MediaEntity, MediaMetadataEntity} from './MediaEntity';
+import {ChildEntity, Column} from 'typeorm';
+import {MediaEntity, MediaMetadataEntity} from './MediaEntity';
 import {VideoDTO, VideoMetadata} from '../../../../common/entities/VideoDTO';
 
 
@@ -8,7 +8,12 @@ export class VideoMetadataEntity extends MediaMetadataEntity implements VideoMet
   @Column('int')
   bitRate: number;
 
-  @Column('bigint')
+  @Column('bigint', {
+    unsigned: true, nullable: true, transformer: {
+      from: v => parseInt(v, 10) || null,
+      to: v => v
+    }
+  })
   duration: number;
 
 }