From efcdacad7d1b7f52f879179701c7e0d9b763511f Mon Sep 17 00:00:00 2001
From: Matthew Hodgson <matthew@matrix.org>
Date: Mon, 23 Jul 2018 22:41:05 +0100
Subject: [PATCH] handle case where types is [] on postgres correctly

---
 synapse/storage/state.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/synapse/storage/state.py b/synapse/storage/state.py
index 40ca8bd2a..f99d3871e 100644
--- a/synapse/storage/state.py
+++ b/synapse/storage/state.py
@@ -255,7 +255,7 @@ class StateGroupWorkerStore(SQLBaseStore):
             # Turns out that postgres doesn't like doing a list of OR's and
             # is about 1000x slower, so we just issue a query for each specific
             # type seperately.
-            if types:
+            if types is not None:
                 clause_to_args = [
                     (
                         "AND type = ? AND state_key = ?",