Add explicit setup of lock values

client.go

@@ -1137,6 +1137,10 @@ func (c *Client) GetClient() *http.Client {
 func (c *Client) Clone() *Client {
 	// dereference the pointer and copy the value
 	cc := *c
+
+	// lock values should not be copied - thus new values are used.
+	cc.afterResponseLock = &sync.RWMutex{}
+	cc.udBeforeRequestLock = &sync.RWMutex{}
 	return &cc
 }