Fix off-by-one-error in synapse_port_db (#9991)

fixes #9979

1 files changed, 1 insertions, 1 deletions

diff --git a/scripts/synapse_port_db b/scripts/synapse_port_db

index 7c7645c05a..86eb76cbca 100755
--- a/scripts/synapse_port_db
+++ b/scripts/synapse_port_db
@@ -959,7 +959,7 @@ class Porter(object):
         def r(txn):
             txn.execute(
                 "ALTER SEQUENCE event_auth_chain_id RESTART WITH %s",
-                (curr_chain_id,),
+                (curr_chain_id + 1,),
             )
 
         if curr_chain_id is not None: