diff --git a/worker2/dep.go b/worker2/dep.go
index 9418821c..79672597 100644
--- a/worker2/dep.go
+++ b/worker2/dep.go
@@ -240,10 +240,19 @@ func (g *Group) LinkDeps() {
 }
 
 func (g *Group) GetDepsObj() *Deps {
+	if g.Deps != nil {
+		return g.Deps
+	}
+
+	g.m.Lock()
+	defer g.m.Unlock()
+
 	if g.Deps == nil {
-		g.Deps = NewDeps()
+		d := NewDeps()
+		d.setOwner(g)
+		g.Deps = d
 	}
-	g.Deps.setOwner(g)
+
 	return g.Deps
 }