diff --git a/src/state/messages/convo/agent.ts b/src/state/messages/convo/agent.ts
index 755d14949e..eed44c7578 100644
--- a/src/state/messages/convo/agent.ts
+++ b/src/state/messages/convo/agent.ts
@@ -704,7 +704,7 @@ export class Convo {
        * If there's a rev, we should handle it. If there's not a rev, we don't
        * know what it is.
        */
-      if ('rev' in ev) {
+      if ('rev' in ev && typeof ev.rev === 'string') {
         const isUninitialized = !this.latestRev
         const isNewEvent = this.latestRev && ev.rev > this.latestRev
 
diff --git a/src/state/messages/events/agent.ts b/src/state/messages/events/agent.ts
index dea71181be..9244a4fa56 100644
--- a/src/state/messages/events/agent.ts
+++ b/src/state/messages/events/agent.ts
@@ -352,7 +352,7 @@ export class MessagesEventBus {
          * If there's a rev, we should handle it. If there's not a rev, we don't
          * know what it is.
          */
-        if ('rev' in ev) {
+        if ('rev' in ev && typeof ev.rev === 'string') {
           /*
            * We only care about new events
            */