diff --git a/client.py b/client.py
index b1ace8f..923d54b 100644
--- a/client.py
+++ b/client.py
@@ -266,7 +266,7 @@ class ClientWrapper(object):
             raise ValueError("Can't broadcast a non-threaded message. Try again.")
 
         # Set blocks iff provided.
-        if blocks:
+        if blocks is not None:
             kwargs["blocks"] = blocks
 
         return self.api_call(api_method, **kwargs)
diff --git a/plugins/periodicals.py b/plugins/periodicals.py
index acf8c58..570997c 100644
--- a/plugins/periodicals.py
+++ b/plugins/periodicals.py
@@ -190,7 +190,7 @@ class TestPassive(hooks.Passive):
                 client.get_slack().edit_message(response, event.conversation.conversation_id, event.message.ts, None)
 
             def on_expire():
-                client.get_slack().edit_message("Timed out", "#botzone", msg_ts, None)
+                client.get_slack().edit_message("Timed out", "#botzone", msg_ts, [])
 
             # Add a listener
             listener = hooks.InteractionListener(on_click,