diff --git a/vendor/github.com/Shopify/sarama/client.go b/vendor/github.com/Shopify/sarama/client.go
index 040cfe9..e5b3557 100644
--- a/vendor/github.com/Shopify/sarama/client.go
+++ b/vendor/github.com/Shopify/sarama/client.go
@@ -242,6 +242,9 @@
 }
 
 func (client *client) Closed() bool {
+	client.lock.RLock()
+	defer client.lock.RUnlock()
+
 	return client.brokers == nil
 }
 
@@ -529,6 +532,11 @@
 // in the brokers map. It returns the broker that is registered, which may be the provided broker,
 // or a previously registered Broker instance. You must hold the write lock before calling this function.
 func (client *client) registerBroker(broker *Broker) {
+	if client.brokers == nil {
+		Logger.Printf("cannot register broker #%d at %s, client already closed", broker.ID(), broker.Addr())
+		return
+	}
+
 	if client.brokers[broker.ID()] == nil {
 		client.brokers[broker.ID()] = broker
 		Logger.Printf("client/brokers registered new broker #%d at %s", broker.ID(), broker.Addr())
@@ -822,7 +830,7 @@
 	}
 
 	if broker != nil {
-		Logger.Println("client/metadata not fetching metadata from broker %s as we would go past the metadata timeout\n", broker.addr)
+		Logger.Printf("client/metadata not fetching metadata from broker %s as we would go past the metadata timeout\n", broker.addr)
 		return retry(ErrOutOfBrokers)
 	}
 
@@ -833,6 +841,10 @@
 
 // if no fatal error, returns a list of topics that need retrying due to ErrLeaderNotAvailable
 func (client *client) updateMetadata(data *MetadataResponse, allKnownMetaData bool) (retry bool, err error) {
+	if client.Closed() {
+		return
+	}
+
 	client.lock.Lock()
 	defer client.lock.Unlock()