Render error

src/domain/session/room/timeline/tiles/BaseMessageTile.js

@@ -91,6 +91,10 @@ export class BaseMessageTile extends SimpleTile {
         return this._entry.isUnverified;
     }
 
+    get isReply() {
+        return this._entry.isReply;
+    }
+
     _getContent() {
         return this._entry.content;
     }

src/platform/web/ui/session/room/timeline/ReplyPreviewView.js

@@ -41,3 +41,11 @@ export class ReplyPreviewView extends TemplateView {
         ]);
     }
 }
+
+export class ReplyPreviewError extends TemplateView {
+    render(t) {
+        return t.blockquote({ className: "ReplyPreviewView" }, [
+            t.div({ className: "Timeline_messageBody statusMessage" }, "This reply could not be found.")
+        ]);
+    }
+}

src/platform/web/ui/session/room/timeline/TextMessageView.js

@@ -16,7 +16,7 @@ limitations under the License.
 
 import {tag, text} from "../../../general/html";
 import {BaseMessageView} from "./BaseMessageView.js";
-import {ReplyPreviewView} from "./ReplyPreviewView.js";
+import {ReplyPreviewError, ReplyPreviewView} from "./ReplyPreviewView.js";
 
 export class TextMessageView extends BaseMessageView {
     renderMessageBody(t, vm) {
@@ -27,7 +27,10 @@ export class TextMessageView extends BaseMessageView {
                 statusMessage: vm => vm.shape === "message-status",
             }
         }, t.mapView(vm => vm.replyTextTile, replyTextTile => {
-            if (replyTextTile && this._interactive) {
+            if (vm.isReply && !replyTextTile) {
+                return new ReplyPreviewError();
+            }
+            else if (replyTextTile && this._interactive) {
                 // if this._interactive = false, this is already a reply preview, don't nest replies for now.
                 return new ReplyPreviewView(replyTextTile);
             }