diff --git a/run.py b/run.py
index 051f863..3812571 100644
--- a/run.py
+++ b/run.py
@@ -527,8 +527,17 @@ def clean_websocket(function):
 
 def chunks(l, n):
     """Yield successive n-sized chunks from l."""
-    for i in range(0, len(l), n):
-        yield l[i:i + n]
+    chunk = []
+    a = 0
+
+    for i in l:
+        if a < n:
+            a += 1
+            chunk.append(i)
+        else:
+            yield chunk
+            chunk = []
+            a = 0
 
 
 @app.websocket('/index-ws')
@@ -556,9 +565,9 @@ async def ws_index(request, websocket):
                              .order_by(-Job.id)
 
     # chunks initial data by batch of 30 to avoid killing firefox
-    data = chunks(list(itertools.chain(map(model_to_dict, next_scheduled_jobs),
-                                       map(model_to_dict, Job.select().where(Job.state == "running")),
-                                       map(model_to_dict, latest_done_jobs))), 30)
+    data = chunks(itertools.chain(map(model_to_dict, next_scheduled_jobs),
+                                  map(model_to_dict, Job.select().where(Job.state == "running")),
+                                  map(model_to_dict, latest_done_jobs)), 30)
 
     await websocket.send(ujson.dumps({
         "action": "init_jobs",