diff --git a/sci-log-db/src/__tests__/acceptance/logbook.controller.acceptance.ts b/sci-log-db/src/__tests__/acceptance/logbook.controller.acceptance.ts
index 02d27f40..a730d487 100644
--- a/sci-log-db/src/__tests__/acceptance/logbook.controller.acceptance.ts
+++ b/sci-log-db/src/__tests__/acceptance/logbook.controller.acceptance.ts
@@ -511,4 +511,25 @@ describe('Logbook', function (this: Suite) {
         throw err;
       });
   });
+
+  it('add thumbnail hash when editing logbook', async () => {
+    const file = await client
+      .post(`/filesnippet`)
+      .set('Authorization', 'Bearer ' + token)
+      .set('Content-Type', 'application/json')
+      .send({accessHash: 'hash', readACL: [logbookSnippet.ownerGroup]})
+      .expect(200);
+    await client
+      .patch(`/logbooks/${logbookSnippetId}`)
+      .set('Authorization', 'Bearer ' + token)
+      .set('Content-Type', 'application/json')
+      .send({thumbnail: file.body.id})
+      .expect(204);
+    await client
+      .get(`/logbooks/${logbookSnippetId}`)
+      .set('Authorization', 'Bearer ' + token)
+      .set('Content-Type', 'application/json')
+      .expect(200)
+      .then(result => expect(result.body.thumbnailHash).to.eql('hash'));
+  });
 });
diff --git a/sci-log-db/src/controllers/image.controller.ts b/sci-log-db/src/controllers/image.controller.ts
index 4dd15521..163eb12a 100644
--- a/sci-log-db/src/controllers/image.controller.ts
+++ b/sci-log-db/src/controllers/image.controller.ts
@@ -32,7 +32,7 @@ export class ImageController {
     }
     const data = dataQuery[0];
     console.log(data);
-    if (typeof data._fileId == 'undefined') {
+    if (typeof data?._fileId == 'undefined') {
       throw new HttpErrors.BadRequest(`Retrieving sandbox data is deprecated.`);
     }
     const bucket = new Mongo.GridFSBucket(
diff --git a/sci-log-db/src/mixins/basesnippet.repository-mixin.ts b/sci-log-db/src/mixins/basesnippet.repository-mixin.ts
index b3cf36d3..39563049 100644
--- a/sci-log-db/src/mixins/basesnippet.repository-mixin.ts
+++ b/sci-log-db/src/mixins/basesnippet.repository-mixin.ts
@@ -25,6 +25,8 @@ const fs = require('fs');
 type ExpandedBasesnippet = Basesnippet & {
   ownerGroup: string;
   accessGroups: string[];
+  thumbnail?: string;
+  thumbnailHash: string;
 };
 
 function UpdateAndDeleteRepositoryMixin<
@@ -59,6 +61,14 @@ function UpdateAndDeleteRepositoryMixin<
     ): Promise<void> {
       const baseSnippetRepository = await this.baseSnippetRepository();
       const snippet = await baseSnippetRepository.findById(id, {}, options);
+      if (basesnippet.thumbnail && !basesnippet.thumbnailHash)
+        basesnippet.thumbnailHash = (
+          await baseSnippetRepository.findById(
+            basesnippet.thumbnail,
+            {},
+            options,
+          )
+        ).accessHash;
       const patches = await this.applyFromOwnerAccessAndGetChanged(
         basesnippet,
         snippet,
diff --git a/sci-log-db/src/models/logbook.model.ts b/sci-log-db/src/models/logbook.model.ts
index 076dfb45..024a3bd5 100644
--- a/sci-log-db/src/models/logbook.model.ts
+++ b/sci-log-db/src/models/logbook.model.ts
@@ -37,6 +37,12 @@ export class Logbook extends Basesnippet {
   })
   thumbnail?: string;
 
+  @property({
+    type: 'string',
+    description: 'Optional hash of the image/logo associated to this logbook',
+  })
+  thumbnailHash?: string;
+
   @property({
     type: 'string',
     required: true,