diff --git a/schema/mysql.sql b/schema/mysql.sql
index 61cf55d6..90da6305 100644
--- a/schema/mysql.sql
+++ b/schema/mysql.sql
@@ -1060,7 +1060,7 @@ CREATE TABLE sync_run (
   rule_id INT(10) UNSIGNED DEFAULT NULL,
   rule_name VARCHAR(255) NOT NULL,
   start_time DATETIME NOT NULL,
-  duration_ms INT(10) UNSIGNED NOT NULL,
+  duration_ms INT(10) UNSIGNED DEFAULT NULL,
   objects_deleted INT(10) UNSIGNED DEFAULT 0,
   objects_created INT(10) UNSIGNED DEFAULT 0,
   objects_modified INT(10) UNSIGNED DEFAULT 0,
@@ -1076,5 +1076,5 @@ CREATE TABLE sync_run (
 
 INSERT INTO director_schema_migration
   SET migration_time = NOW(),
-      schema_version = 67;
+      schema_version = 68