From 2e6f3898baf7e5d8c208183bf8c9aa8f6e3b30a2 Mon Sep 17 00:00:00 2001
From: Charles Haley <github@charles.haleys.org>
Date: Wed, 5 Aug 2015 12:09:47 +0200
Subject: [PATCH] drop the trigger only if it exists

---
 src/calibre/db/schema_upgrades.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/calibre/db/schema_upgrades.py b/src/calibre/db/schema_upgrades.py
index 5083a07a28..bfa9c5bc83 100644
--- a/src/calibre/db/schema_upgrades.py
+++ b/src/calibre/db/schema_upgrades.py
@@ -621,8 +621,8 @@ class SchemaUpgrade(object):
         '''
 
         script = '''
-        DROP TRIGGER series_insert_trg;
-        DROP TRIGGER series_update_trg;
+        DROP TRIGGER IF EXISTS series_insert_trg;
+        DROP TRIGGER IF EXISTS series_update_trg;
 
         UPDATE series SET sort=title_sort(name);