Use cause in place of err in GetOrNewStacktrace

Author: martinxsliu

client.go

@@ -318,7 +318,7 @@ func newTransport() Transport {
 	} else {
 		t.Client = &http.Client{
 			Transport: &http.Transport{
-				Proxy: http.ProxyFromEnvironment,
+				Proxy:           http.ProxyFromEnvironment,
 				TLSClientConfig: &tls.Config{RootCAs: rootCAs},
 			},
 		}
@@ -642,7 +642,7 @@ func (client *Client) CaptureError(err error, tags map[string]string, interfaces
 
 	cause := pkgErrors.Cause(err)
 
-	packet := NewPacket(cause.Error(), append(append(interfaces, client.context.interfaces()...), NewException(cause, GetOrNewStacktrace(err, 1, 3, client.includePaths)))...)
+	packet := NewPacket(cause.Error(), append(append(interfaces, client.context.interfaces()...), NewException(cause, GetOrNewStacktrace(cause, 1, 3, client.includePaths)))...)
 	eventID, _ := client.Capture(packet, tags)
 
 	return eventID
@@ -664,7 +664,9 @@ func (client *Client) CaptureErrorAndWait(err error, tags map[string]string, int
 		return ""
 	}
 
-	packet := NewPacket(err.Error(), append(append(interfaces, client.context.interfaces()...), NewException(err, NewStacktrace(1, 3, client.includePaths)))...)
+	cause := pkgErrors.Cause(err)
+
+	packet := NewPacket(cause.Error(), append(append(interfaces, client.context.interfaces()...), NewException(cause, GetOrNewStacktrace(cause, 1, 3, client.includePaths)))...)
 	eventID, ch := client.Capture(packet, tags)
 	<-ch