diff --git a/storage/sql/migrate.go b/storage/sql/migrate.go
index ecf1ae77..5b86bc78 100644
--- a/storage/sql/migrate.go
+++ b/storage/sql/migrate.go
@@ -205,7 +205,7 @@ var migrations = []migration{
 	{
 		stmts: []string{`
 			alter table offline_session
-				add column connector_data bytea not null default '';
+				add column connector_data bytea;
 			`,
 		},
 	},