diff --git a/addons/web_editor/static/src/components/upload_progress_toast/upload_progress_toast.js b/addons/web_editor/static/src/components/upload_progress_toast/upload_progress_toast.js
index cb23e0943b4..5625a1c21e7 100644
--- a/addons/web_editor/static/src/components/upload_progress_toast/upload_progress_toast.js
+++ b/addons/web_editor/static/src/components/upload_progress_toast/upload_progress_toast.js
@@ -10,12 +10,19 @@ export class ProgressBar extends Component {
 }
 ProgressBar.template = 'web_editor.ProgressBar';
 ProgressBar.props = {
-    progress: Number,
-    hasError: Boolean,
-    uploaded: Boolean,
+    progress: { type: Number, optional: true },
+    hasError: { type: Boolean, optional: true },
+    uploaded: { type: Boolean, optional: true },
     name: String,
-    size: String,
-    errorMessage: String,
+    size: { type: String, optional: true },
+    errorMessage: { type: String, optional: true },
+};
+ProgressBar.defaultProps = {
+    progress: 0,
+    hasError: false,
+    uploaded: false,
+    size: "",
+    errorMessage: "",
 };
 
 export class UploadProgressToast extends Component {
diff --git a/addons/web_editor/static/src/components/upload_progress_toast/upload_service.js b/addons/web_editor/static/src/components/upload_progress_toast/upload_service.js
index 8aa461caf4b..5dcf3dc82cd 100644
--- a/addons/web_editor/static/src/components/upload_progress_toast/upload_service.js
+++ b/addons/web_editor/static/src/components/upload_progress_toast/upload_service.js
@@ -74,7 +74,7 @@ export const uploadService = {
                         return null;
                     }
                     if (!fileSize) {
-                        fileSize = null;
+                        fileSize = "";
                     } else {
                         fileSize = humanNumber(fileSize) + "B";
                     }
@@ -87,10 +87,6 @@ export const uploadService = {
                         id,
                         name: file.name,
                         size: fileSize,
-                        progress: 0,
-                        hasError: false,
-                        uploaded: false,
-                        errorMessage: '',
                     });
                 }
 
diff --git a/addons/web_unsplash/static/src/components/media_dialog/image_selector.js b/addons/web_unsplash/static/src/components/media_dialog/image_selector.js
index e716dc7afef..cf1ad7b29cb 100644
--- a/addons/web_unsplash/static/src/components/media_dialog/image_selector.js
+++ b/addons/web_unsplash/static/src/components/media_dialog/image_selector.js
@@ -246,8 +246,6 @@ patch(uploadService, {
                     name: records.length > 1 ?
                     _t("Uploading %s '%s' images.", records.length, records[0].query) :
                     _t("Uploading '%s' image.", records[0].query),
-                    size: null,
-                    progress: 0,
                 });
 
                 try {