issue with enum-sessions script

["Mike ." <dmciscobgp () hotmail com>]

so i am not sure if this is the proper behavoir and output i am supposed to see here. i normally dont bother looking 
for netbios servers, but i was just in that kinda mood, i guess. i ran the afforementioned script and got this over and 
over, as if it was in a loop. i am assuming it has something to do with the SMB negprot? i don't even get an error or 
anything after i run it. this is what i am seeing after the query
Nmap scan report for ***********Host is up, received user-set (0.060s latency).Scanned at 2014-11-26 13:43:14 Central 
Standard Time for 2sPORT    STATE SERVICE      REASON135/tcp open  msrpc        syn-ack139/tcp open  netbios-ssn  
syn-ack445/tcp open  microsoft-ds syn-ack
NSE: Script Post-scanning.NSE: Starting runlevel 1 (of 1) scan.Read data files from: C:\Program Files\NmapNmap done: 1 
IP address (1 host up) scanned in 2.91 seconds           Raw packets sent: 3 (132B) | Rcvd: 3 (132B)
cmd ran was this: nmap -n -Pn -vv -T4 -max-retries 1 -reason (ip) -script=smb-enum-sessions.nse -p 139,445,135 
and this is the error i kept getting in  a loop
NSE: TCP unknown protocol:0 > unknown protocol:0 | CLOSE
in the packet activity i noticed the SMB negprot was V2. shouldn't the script then try and switch to that or at least 
give me some error for output?
thanks | mike

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