diff --git a/models/migrations/v64.go b/models/migrations/v64.go
index 5958cd8f8259f..a18e39c1b0601 100644
--- a/models/migrations/v64.go
+++ b/models/migrations/v64.go
@@ -124,6 +124,11 @@ func addMultipleAssignees(x *xorm.Engine) error {
 	if err := sess.Commit(); err != nil {
 		return err
 	}
+
+	sess.Close()
+	sess = x.NewSession()
+	defer sess.Close()
+
 	if err := sess.Begin(); err != nil {
 		return err
 	}
diff --git a/models/migrations/v69.go b/models/migrations/v69.go
index 9a6e42e712ddf..f90109fffde17 100644
--- a/models/migrations/v69.go
+++ b/models/migrations/v69.go
@@ -77,6 +77,11 @@ func moveTeamUnitsToTeamUnitTable(x *xorm.Engine) error {
 	if err := sess.Commit(); err != nil {
 		return err
 	}
+
+	sess.Close()
+	sess = x.NewSession()
+	defer sess.Close()
+
 	if err := sess.Begin(); err != nil {
 		return err
 	}