diff --git a/lib/shared/edit-messages-utils.js b/lib/shared/edit-messages-utils.js
--- a/lib/shared/edit-messages-utils.js
+++ b/lib/shared/edit-messages-utils.js
@@ -1,6 +1,5 @@
 // @flow
 
-import invariant from 'invariant';
 import * as React from 'react';
 
 import { threadIsPending, threadHasPermission } from './thread-utils.js';
@@ -23,7 +22,7 @@
 import { useSelector } from '../utils/redux-utils.js';
 
 function useEditMessage(): (
-  messageID?: string,
+  messageID: string,
   newText: string,
 ) => Promise<SendEditMessageResult> {
   const callEditMessage = useServerCall(sendEditMessage);
@@ -31,8 +30,6 @@
 
   return React.useCallback(
     (messageID, newText) => {
-      invariant(messageID, 'messageID should be set!');
-
       const editMessagePromise = (async () => {
         const result = await callEditMessage({
           targetMessageID: messageID,