diff --git a/lib/shared/sidebar-utils.js b/lib/shared/sidebar-utils.js
--- a/lib/shared/sidebar-utils.js
+++ b/lib/shared/sidebar-utils.js
@@ -218,7 +218,8 @@
         .canActionsTargetPendingMessages) ||
     (threadInfo.sourceMessageID &&
       threadInfo.sourceMessageID === messageInfo.id) ||
-    isInvalidSidebarSource(messageInfo)
+    isInvalidSidebarSource(messageInfo) ||
+    !threadSpecs[threadInfo.type].protocol().sidebarConfig
   ) {
     return false;
   }
diff --git a/native/chat/sidebar-navigation.js b/native/chat/sidebar-navigation.js
--- a/native/chat/sidebar-navigation.js
+++ b/native/chat/sidebar-navigation.js
@@ -12,6 +12,7 @@
   createPendingSidebar,
   createUnresolvedPendingSidebar,
 } from 'lib/shared/sidebar-utils.js';
+import { threadSpecs } from 'lib/shared/threads/thread-specs.js';
 import type { ThreadInfo } from 'lib/types/minimally-encoded-thread-permissions-types.js';
 import type { ChatMentionCandidates } from 'lib/types/thread-types.js';
 import type { LoggedInUserInfo } from 'lib/types/user-types.js';
@@ -42,6 +43,11 @@
   }
 
   const { threadInfo } = sourceMessage;
+
+  if (!threadSpecs[threadInfo.type].protocol().sidebarConfig) {
+    return null;
+  }
+
   const messageInfo = chatMessageItemEngagementTargetMessageInfo(sourceMessage);
   if (!messageInfo) {
     return null;