diff --git a/studio/src/app/services/editor/offline/offline.service.ts b/studio/src/app/services/editor/offline/offline.service.ts
index 2622f72a4..fd98e9832 100644
--- a/studio/src/app/services/editor/offline/offline.service.ts
+++ b/studio/src/app/services/editor/offline/offline.service.ts
@@ -11,7 +11,6 @@ import {Slide, SlideAttributes} from '../../../models/data/slide';
 
 import {SlotType} from '../../../types/editor/slot-type';
 
-import {OfflineUtils} from '../../../utils/editor/offline.utils';
 import {FirestoreUtils} from '../../../utils/editor/firestore.utils';
 import {ServiceWorkerUtils} from '../../../utils/core/service-worker.utils';
 
@@ -633,7 +632,7 @@ export class OfflineService {
           return;
         }
 
-        slide.data.attributes = (await OfflineUtils.prepareAttributes(slide.data.attributes)) as SlideAttributes;
+        slide.data.attributes = (await FirestoreUtils.prepareAttributes(slide.data.attributes)) as SlideAttributes;
 
         if (slide.data.content === null) {
           // @ts-ignore
@@ -669,7 +668,7 @@ export class OfflineService {
           return;
         }
 
-        deck.data.attributes = (await OfflineUtils.prepareAttributes(deck.data.attributes)) as DeckAttributes;
+        deck.data.attributes = (await FirestoreUtils.prepareAttributes(deck.data.attributes)) as DeckAttributes;
 
         if (deck.data.background === null) {
           // @ts-ignore
diff --git a/studio/src/app/utils/editor/firestore.utils.ts b/studio/src/app/utils/editor/firestore.utils.ts
index 8edc0f8e0..29ee74e17 100644
--- a/studio/src/app/utils/editor/firestore.utils.ts
+++ b/studio/src/app/utils/editor/firestore.utils.ts
@@ -1,6 +1,9 @@
 import firebase from 'firebase/app';
 import 'firebase/firestore';
 
+import {SlideAttributes} from '../../models/data/slide';
+import {DeckAttributes} from '../../models/data/deck';
+
 export class FirestoreUtils {
   static filterDelete<T>(obj: T, replaceWithNull: boolean = false): T {
     if (typeof obj !== 'object' || Array.isArray(obj)) {
@@ -35,4 +38,30 @@ export class FirestoreUtils {
 
     return JSON.stringify(attr) === JSON.stringify(firebase.firestore.FieldValue.delete());
   }
+
+  static async prepareAttributes(attributes: SlideAttributes | DeckAttributes): Promise<SlideAttributes | DeckAttributes> {
+    if (!attributes) {
+      // @ts-ignore
+      return firebase.firestore.FieldValue.delete();
+    }
+
+    const keys: string[] = Object.keys(attributes);
+
+    if (!keys || keys.length <= 0) {
+      // @ts-ignore
+      return firebase.firestore.FieldValue.delete();
+    }
+
+    keys.forEach((key: string) => {
+      const attr = attributes[key];
+
+      // Replace null values with Firestore "to delete fields"
+      if (attr === null) {
+        // @ts-ignore
+        attributes[key] = firebase.firestore.FieldValue.delete();
+      }
+    });
+
+    return attributes;
+  }
 }
diff --git a/studio/src/app/utils/editor/offline.utils.ts b/studio/src/app/utils/editor/offline.utils.ts
index d3ff264f0..aad08e6a5 100644
--- a/studio/src/app/utils/editor/offline.utils.ts
+++ b/studio/src/app/utils/editor/offline.utils.ts
@@ -1,5 +1,3 @@
-import firebase from 'firebase/app';
-
 import {SlideAttributes} from '../../models/data/slide';
 import {DeckAttributes} from '../../models/data/deck';
 
@@ -19,34 +17,4 @@ export class OfflineUtils {
 
     return FirestoreUtils.filterDelete(attributes, true);
   }
-
-  static prepareAttributes(attributes: SlideAttributes | DeckAttributes): Promise<SlideAttributes | DeckAttributes> {
-    return new Promise<SlideAttributes | DeckAttributes>((resolve) => {
-      if (!attributes) {
-        // @ts-ignore
-        resolve(firebase.firestore.FieldValue.delete());
-        return;
-      }
-
-      const keys: string[] = Object.keys(attributes);
-
-      if (!keys || keys.length <= 0) {
-        // @ts-ignore
-        resolve(firebase.firestore.FieldValue.delete());
-        return;
-      }
-
-      keys.forEach((key: string) => {
-        const attr = attributes[key];
-
-        // Replace null values with Firestore "to delete fields"
-        if (attr === null) {
-          // @ts-ignore
-          attributes[key] = firebase.firestore.FieldValue.delete();
-        }
-      });
-
-      resolve(attributes);
-    });
-  }
 }