fixed bug

internal/appchain/manager.go

@@ -31,8 +31,9 @@ func NewManager(clients []plugins.Client, cryptor txcrypto.Cryptor, logger logru
 
 func (m *Manager) Start() error {
 	for _, appChain := range m.appChains {
+		a := appChain
 		m.g.Go(func() error {
-			return appChain.Start()
+			return a.Start()
 		})
 	}
 	return m.g.Wait()
@@ -40,8 +41,9 @@ func (m *Manager) Start() error {
 
 func (m *Manager) Stop() error {
 	for _, appChain := range m.appChains {
+		a := appChain
 		m.g.Go(func() error {
-			return appChain.Stop()
+			return a.Stop()
 		})
 	}
 	m.cancel()