From ae19a7db8c5eab43858b24453bbbb352f8b6152a Mon Sep 17 00:00:00 2001
From: rkfg <rkfg@rkfg.me>
Date: Thu, 6 Dec 2018 13:32:05 +0300
Subject: [PATCH] Prevent crash on pagination.

---
 changelog.d/4263.bugfix        | 1 +
 synapse/handlers/pagination.py | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)
 create mode 100644 changelog.d/4263.bugfix

diff --git a/changelog.d/4263.bugfix b/changelog.d/4263.bugfix
new file mode 100644
index 0000000000..3dc1d7c732
--- /dev/null
+++ b/changelog.d/4263.bugfix
@@ -0,0 +1 @@
+Prevent crash on pagination.
diff --git a/synapse/handlers/pagination.py b/synapse/handlers/pagination.py
index 43f81bd607..f2be6c1185 100644
--- a/synapse/handlers/pagination.py
+++ b/synapse/handlers/pagination.py
@@ -253,7 +253,7 @@ class PaginationHandler(object):
         )
 
         state = None
-        if event_filter and event_filter.lazy_load_members():
+        if event_filter and event_filter.lazy_load_members() and len(events) > 0:
             # TODO: remove redundant members
 
             # FIXME: we also care about invite targets etc.