diff --git a/public/lib/eventemitter.js b/public/lib/eventemitter.js
index 046991a05..a1b40e38c 100644
--- a/public/lib/eventemitter.js
+++ b/public/lib/eventemitter.js
@@ -29,6 +29,12 @@ var EventEmitter = function () {
 };
 
 EventEmitter.prototype.on = function (event, listener) {
+    // Unknown event used by external libraries?
+    if (event === undefined) {
+        console.trace('EventEmitter: Cannot listen to undefined event');
+        return;
+    }
+
     if (typeof this.events[event] !== 'object') {
         this.events[event] = [];
     }
diff --git a/public/script.js b/public/script.js
index 3078d8a88..805f54dff 100644
--- a/public/script.js
+++ b/public/script.js
@@ -416,6 +416,7 @@ export const event_types = {
     // TODO: Naming convention is inconsistent with other events
     CHARACTER_DELETED: 'characterDeleted',
     CHARACTER_DUPLICATED: 'character_duplicated',
+    SMOOTH_STREAM_TOKEN_RECEIVED: 'smooth_stream_token_received',
 };
 
 export const eventSource = new EventEmitter();
diff --git a/public/scripts/sse-stream.js b/public/scripts/sse-stream.js
index ad50798d4..86caf38d7 100644
--- a/public/scripts/sse-stream.js
+++ b/public/scripts/sse-stream.js
@@ -1,3 +1,4 @@
+import { eventSource, event_types } from '../script.js';
 import { power_user } from './power-user.js';
 import { delay } from './utils.js';
 
@@ -257,6 +258,7 @@ export class SmoothEventSourceStream extends EventSourceStream {
                         hasFocus && await delay(getDelay(lastStr));
                         controller.enqueue(new MessageEvent(event.type, { data: JSON.stringify(parsed.data) }));
                         lastStr = parsed.chunk;
+                        hasFocus && await eventSource.emit(event_types.SMOOTH_STREAM_TOKEN_RECEIVED, parsed.chunk);
                     }
                 } catch {
                     controller.enqueue(event);