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-rw-r--r--synapse/handlers/room_list.py3
1 files changed, 2 insertions, 1 deletions
diff --git a/synapse/handlers/room_list.py b/synapse/handlers/room_list.py
index bb40075387..dfa09141ed 100644
--- a/synapse/handlers/room_list.py
+++ b/synapse/handlers/room_list.py
@@ -203,7 +203,8 @@ class RoomListHandler(BaseHandler):
         if limit:
             step = limit + 1
         else:
-            step = len(rooms_to_scan)
+            # step cannot be zero
+            step = len(rooms_to_scan) if len(rooms_to_scan) != 0 else 1
 
         chunk = []
         for i in xrange(0, len(rooms_to_scan), step):