diff --git a/libs/annotation/src/lib/annotation.ts b/libs/annotation/src/lib/annotation.ts
index 649f81b47..971ea690a 100644
--- a/libs/annotation/src/lib/annotation.ts
+++ b/libs/annotation/src/lib/annotation.ts
@@ -328,7 +328,7 @@ export class OctraAnnotation<
               new OctraAnnotationSegment(
                 this.idCounters.item++,
                 time!,
-                labels ?? oldLabels,
+                labels && (labels.length > 0) ? labels : oldLabels,
                 context ?? {}
               ) as any,
             ];
@@ -880,7 +880,9 @@ export class OctraAnnotationEventLevel {
 
   getRightSibling(item: OctraAnnotationEvent) {
     const index = this.items.findIndex((a) => a.id === item.id);
-    return index > -1 && index < this.items.length - 1 ? this.items[index + 1] : undefined;
+    return index > -1 && index < this.items.length - 1
+      ? this.items[index + 1]
+      : undefined;
   }
 }
 
diff --git a/libs/ngx-components/src/lib/components/audio/audio-viewer/audio-viewer.service.ts b/libs/ngx-components/src/lib/components/audio/audio-viewer/audio-viewer.service.ts
index 21fda15b0..630533fb2 100644
--- a/libs/ngx-components/src/lib/components/audio/audio-viewer/audio-viewer.service.ts
+++ b/libs/ngx-components/src/lib/components/audio/audio-viewer/audio-viewer.service.ts
@@ -893,8 +893,7 @@ export class AudioViewerService {
         // no selection
 
         this.addSegment(
-          this.audioManager!.createSampleUnit(Math.round(absXTime)),
-          ''
+          this.audioManager!.createSampleUnit(Math.round(absXTime))
         );
 
         return {
@@ -1199,16 +1198,18 @@ export class AudioViewerService {
   }
 
   public addSegment(start: SampleUnit, value?: string) {
-    const result = this.annotation!.addItemToCurrentLevel(start, [
-      new OLabel(this.currentLevel!.name, value ?? ''),
-    ]);
+    const result = this.annotation!.addItemToCurrentLevel(
+      start,
+      value ? [new OLabel(this.currentLevel!.name, value)] : undefined
+    );
     this.currentLevelChange.emit({
       type: 'add',
       items: [
         {
-          instance: this.annotation!.createSegment(start, [
-            new OLabel(this.currentLevel!.name, value ?? ''),
-          ]),
+          instance: this.annotation!.createSegment(
+            start,
+            value ? [new OLabel(this.currentLevel!.name, value)] : undefined
+          ),
         },
       ],
     });