diff --git a/backend/middlewares/thumbnail/ThumbnailGeneratorMWs.ts b/backend/middlewares/thumbnail/ThumbnailGeneratorMWs.ts
index 027e37e..8d32dc3 100644
--- a/backend/middlewares/thumbnail/ThumbnailGeneratorMWs.ts
+++ b/backend/middlewares/thumbnail/ThumbnailGeneratorMWs.ts
@@ -11,10 +11,9 @@ import {Config} from '../../../common/config/private/Config';
 import {ThumbnailProcessingLib} from '../../../common/config/private/IPrivateConfig';
 import {ThumbnailTH} from '../../model/threading/ThreadPool';
 import {RendererInput, ThumbnailSourceType, ThumbnailWorker} from '../../model/threading/ThumbnailWorker';
-
 import {MediaDTO} from '../../../common/entities/MediaDTO';
 import {ITaskExecuter, TaskExecuter} from '../../model/threading/TaskExecuter';
-import {PhotoDTO} from '../../../common/entities/PhotoDTO';
+import {FaceRegion, PhotoDTO} from '../../../common/entities/PhotoDTO';
 
 
 export class ThumbnailGeneratorMWs {
@@ -87,17 +86,17 @@ export class ThumbnailGeneratorMWs {
     // load parameters
     const mediaPath = path.join(ProjectPath.ImageFolder, photo.directory.path, photo.directory.name, photo.name);
     const size: number = Config.Client.Thumbnail.personThumbnailSize;
-    const personName = photo.metadata.faces[0].name;
     // generate thumbnail path
-    const thPath = path.join(ProjectPath.ThumbnailFolder, ThumbnailGeneratorMWs.generatePersonThumbnailName(mediaPath, personName, size));
+    const thPath = path.join(ProjectPath.ThumbnailFolder,
+      ThumbnailGeneratorMWs.generatePersonThumbnailName(mediaPath, photo.metadata.faces[0], size));
 
 
     req.resultPipe = thPath;
 
     // check if thumbnail already exist
     if (fs.existsSync(thPath) === true) {
-        return next();
-      }
+      return next();
+    }
 
     // create thumbnail folder if not exist
     if (!fs.existsSync(ProjectPath.ThumbnailFolder)) {
@@ -170,8 +169,9 @@ export class ThumbnailGeneratorMWs {
     return crypto.createHash('md5').update(mediaPath).digest('hex') + '_' + size + '.jpg';
   }
 
-  public static generatePersonThumbnailName(mediaPath: string, personName: string, size: number): string {
-    return crypto.createHash('md5').update(mediaPath + '_' + personName).digest('hex') + '_' + size + '.jpg';
+  public static generatePersonThumbnailName(mediaPath: string, faceRegion: FaceRegion, size: number): string {
+    return crypto.createHash('md5').update(mediaPath + '_' + faceRegion.name + '_' + faceRegion.box.x + '_' + faceRegion.box.y)
+      .digest('hex') + '_' + size + '.jpg';
   }
 
   private static addThInfoTODir(directory: DirectoryDTO) {
diff --git a/backend/model/threading/ThumbnailWorker.ts b/backend/model/threading/ThumbnailWorker.ts
index 374164f..4279980 100644
--- a/backend/model/threading/ThumbnailWorker.ts
+++ b/backend/model/threading/ThumbnailWorker.ts
@@ -66,7 +66,7 @@ export class VideoRendererFactory {
 
         ffmpeg(input.mediaPath).ffprobe((err: any, data: FfprobeData) => {
           if (!!err || data === null) {
-            return reject(err.toString());
+            return reject('[FFmpeg] ' + err.toString());
           }
           /// console.log(data);
           let width = null;
@@ -79,7 +79,7 @@ export class VideoRendererFactory {
             }
           }
           if (!width || !height) {
-            return reject('Can not read video dimension');
+            return reject('[FFmpeg] Can not read video dimension');
           }
           const ratio = height / width;
           const command: FfmpegCommand = ffmpeg(input.mediaPath);
@@ -94,7 +94,7 @@ export class VideoRendererFactory {
               resolve();
             })
             .on('error', (e) => {
-              reject(e.toString() + ' executed: ' + executedCmd);
+              reject('[FFmpeg] ' + e.toString() + ' executed: ' + executedCmd);
             })
             .outputOptions(['-qscale:v 4']);
           if (input.makeSquare === false) {
@@ -168,7 +168,7 @@ export class ImageRendererFactory {
       await new Promise((resolve, reject) => {
         image.write(input.thPath, (err: Error | null) => { // save
           if (err) {
-            return reject(err);
+            return reject('[JimpThRenderer] ' + err.toString());
           }
           resolve();
         });
@@ -233,7 +233,7 @@ export class ImageRendererFactory {
         let image: State = gm(input.mediaPath);
         image.size((err, value: Dimensions) => {
           if (err) {
-            return reject(err);
+            return reject('[GMThRenderer] ' + err.toString());
           }
 
           /**
@@ -259,12 +259,12 @@ export class ImageRendererFactory {
             }
             image.write(input.thPath, (e) => {
               if (e) {
-                return reject(e);
+                return reject('[GMThRenderer] ' + e.toString());
               }
               return resolve();
             });
           } catch (err) {
-            return reject(err);
+            return reject('[GMThRenderer] ' + err.toString());
           }
         });
       });
diff --git a/frontend/app/duplicates/duplicates.component.ts b/frontend/app/duplicates/duplicates.component.ts
index 79c4b2d..8654f8f 100644
--- a/frontend/app/duplicates/duplicates.component.ts
+++ b/frontend/app/duplicates/duplicates.component.ts
@@ -95,6 +95,10 @@ export class DuplicateComponent implements OnDestroy {
       this.renderTimer = null;
     }
 
+    if (this.directoryGroups.length === 0) {
+      return;
+    }
+
     if (this.renderedIndex.group === this.directoryGroups.length - 1 &&
       this.renderedIndex.pairs >=
       this.directoryGroups[this.renderedIndex.group].duplicates.length) {
diff --git a/frontend/app/gallery/grid/photo/photo.grid.gallery.component.ts b/frontend/app/gallery/grid/photo/photo.grid.gallery.component.ts
index 43e56ed..2a1c3c6 100644
--- a/frontend/app/gallery/grid/photo/photo.grid.gallery.component.ts
+++ b/frontend/app/gallery/grid/photo/photo.grid.gallery.component.ts
@@ -62,7 +62,9 @@ export class GalleryPhotoComponent implements IRenderable, OnInit, OnDestroy {
     const metadata = this.gridPhoto.media.metadata as PhotoMetadata;
     if ((metadata.keywords && metadata.keywords.length > 0) ||
       (metadata.faces && metadata.faces.length > 0)) {
-      this.keywords = (metadata.faces || []).map(f => ({value: f.name, type: SearchTypes.person}))
+      const names: string[] = (metadata.faces || []).map(f => f.name);
+      this.keywords = names.filter((name, index) => names.indexOf(name) === index)
+        .map(n => ({value: n, type: SearchTypes.person}))
         .concat((metadata.keywords || []).map(k => ({value: k, type: SearchTypes.keyword})));
     }
 
diff --git a/frontend/app/gallery/share.service.ts b/frontend/app/gallery/share.service.ts
index fd0bd19..525de4a 100644
--- a/frontend/app/gallery/share.service.ts
+++ b/frontend/app/gallery/share.service.ts
@@ -53,7 +53,6 @@ export class ShareService {
   public setUserObs(userOB: Observable<UserDTO>) {
 
     userOB.subscribe((user) => {
-      console.log(user);
       if (user && !!user.usedSharingKey) {
         if (user.usedSharingKey !== this.sharingKey) {
           this.sharingKey = user.usedSharingKey;