diff --git a/src/components/views/rooms/EditMessageComposer.tsx b/src/components/views/rooms/EditMessageComposer.tsx
index e75168d413..a9f756d1c2 100644
--- a/src/components/views/rooms/EditMessageComposer.tsx
+++ b/src/components/views/rooms/EditMessageComposer.tsx
@@ -60,7 +60,7 @@ function getHtmlReplyFallback(mxEvent: MatrixEvent): string {
 
 function getTextReplyFallback(mxEvent: MatrixEvent): string {
     const body = mxEvent.getContent().body;
-    if (!body) {
+    if (!body || typeof body !== 'string') {
         return "";
     }
     const lines = body.split("\n").map(l => l.trim());