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WEB: Buffer overflow

Hi.

I have a problem with 6lbr.

My 6lbr.log is 

Wed Apr 26 16:10:59 UTC 2017 : Starting 6LBR
/usr/lib/6lbr/bin/cetic_6lbr_router -c /etc/6lbr/nvm.dat -o /etc/6lbr/nvm.conf -s /dev/ttyUSB0 -r -t eth0 -B 115200 -U /usr/lib/6lbr/6lbr-ifup -D /usr/lib/6lbr/6lbr-ifdown -w /usr/lib/6lbr/www -L 3 -W /var/log/6lbr.timestamp -P 60 -C /var/log/6lbr.ip -m /usr/lib/6lbr/plugins
Contiki-contiki-base-develop-20170120-2305-g98a3eac started with IPV6, RPL
Rime started with address 1.2.3.4.5.6.7.8
MAC mac_wrapper RDC br-rdc SEC llsec-wrapper NETWORK sicslowpan
2017-04-26 16:10:59.634509: NOTICE: 6LBR: Starting 6LBR version 1.5.x (Contiki-contiki-base-develop-20170120-2305-g98a3eac)
2017-04-26 16:10:59.635318: INFO: ETH: 6LBR watchdog started (interval: 60)
2017-04-26 16:10:59.641456: INFO: NVM: NVM Magic : 2009
2017-04-26 16:10:59.641601: INFO: NVM: NVM Version : 5
2017-04-26 16:10:59.641614: INFO: CONFIG: Loading configuration : /etc/6lbr/nvm.conf
2017-04-26 16:10:59.641700: WARN: CONFIG: Can not open /etc/6lbr/nvm.conf : No such file or directory
2017-04-26 16:10:59.641799: NOTICE: 6LBR: Log level: 30 (services: ffffffff)
2017-04-26 16:10:59.641814: INFO: MAC: Using 'csma' mac driver
2017-04-26 16:10:59.650531: INFO: SLIP: SLIP started on /dev/ttyUSB0
2017-04-26 16:10:59.662023: INFO: SCMD: Started br-cmd process
2017-04-26 16:10:59.662198: INFO: BR-RDC: Reset SLIP Radio
2017-04-26 16:10:59.662254: INFO: BR-RDC: Fetching MAC address
2017-04-26 16:10:59.665667: ERROR: SLIP: Unknown command
2017-04-26 16:10:59.667676: ERROR: SLIP: Unknown command
2017-04-26 16:10:59.668655: INFO: BR-RDC: Got MAC: 00:12:4b:00:08:68:0d:6c
2017-04-26 16:11:00.665671: ERROR: SLIP: Unknown command
2017-04-26 16:11:00.667584: ERROR: BR-RDC: Set channel failed
2017-04-26 16:11:00.672612: ERROR: SLIP: Unknown command
2017-04-26 16:11:00.674276: ERROR: BR-RDC: Set PAN-ID failed
2017-04-26 16:11:00.675516: INFO: ETH: RAW Ethernet interface init
2017-04-26 16:11:00.693041: INFO: TAP: opened device /dev/eth0
2017-04-26 16:11:00.694802: INFO: TAP: Running 6lbr-ifup script '/usr/lib/6lbr/6lbr-ifup'
eth0 Link encap:Ethernet HWaddr d0:39:72:44:e9:83
inet addr:192.168.1.14 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::d239:72ff:fe44:e983/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:382 errors:0 dropped:0 overruns:0 frame:0
TX packets:306 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:50357 (49.1 KiB) TX bytes:48168 (47.0 KiB)
Interrupt:40

2017-04-26 16:11:00.828664: INFO: TAP: Eth MAC address : d0:39:72:44:e9:83
2017-04-26 16:11:00.831080: INFO: ETH: Eth MAC address : d0:39:72:44:e9:83
2017-04-26 16:11:00.833256: INFO: LLSEC: Using 802.15.4 framer
2017-04-26 16:11:00.833900: INFO: LLSEC: Using 'nullsec' llsec driver
2017-04-26 16:11:00.835170: INFO: 6LBR: Tentative local IPv6 address fe80::212:4b00:868:d6c
2017-04-26 16:11:00.836097: INFO: 6LBR: Tentative global IPv6 address (WSN) fd00::212:4b00:868:d6c
2017-04-26 16:11:00.836406: INFO: 6LBR: Tentative global IPv6 address (ETH) bbbb::100
2017-04-26 16:11:00.836588: INFO: 6LBR: RA Daemon enabled
2017-04-26 16:11:00.836713: INFO: 6LBR: Checking addresses duplication
2017-04-26 16:11:12.839835: INFO: 6LBR: Configured as DODAG Root fd00::212:4b00:868:d6c
2017-04-26 16:11:12.845857: INFO: 6LBR: Starting as RPL ROUTER
2017-04-26 16:11:12.851754: WARN: CONFIG: Can not open /etc/6lbr/nvm.conf : No such file or directory
2017-04-26 16:11:12.856463: INFO: HTTP: Starting webserver on port 80
2017-04-26 16:11:12.860153: INFO: NODECFG: Node Config init
2017-04-26 16:11:12.860520: INFO: NODECFG: No node_config.conf file specified
2017-04-26 16:11:12.862200: WARN: CONFIG: Can not open /etc/6lbr/nvm.conf : No such file or directory
2017-04-26 16:11:12.865849: INFO: UDPS: UDP server started
CoAP push started
CoAP server started
2017-04-26 16:11:12.868953: INFO: DNS: DNS proxy started
2017-04-26 16:11:12.869326: WARN: CONFIG: Can not open /etc/6lbr/nvm.conf : No such file or directory
2017-04-26 16:11:12.869672: INFO: 6LBR: CETIC 6LBR Started
RD client started
2017-04-26 16:11:28.476309: WARN: HTTP: File '/favicon.ico' not found, from bbbb::4ce:9ea5:b179:6725
2017-04-26 16:11:28.494090: WARN: WEB: Buffer overflow
2017-04-26 16:29:10.809988: FATAL: TAP: signal 15
2017-04-26 16:29:10.811718: INFO: TAP: Running 6lbr-ifdown script '/usr/lib/6lbr/6lbr-ifdown'
2017-04-26 16:29:10.947000: INFO: BR-RDC: Set MAC: 00:00:00:00:00:00:00:00

I could get 6lbr page, but when I press other tabs, browser couldn't be connected to that pages.

I don't know why message 'WEB: Buffer overflow' is appeared.

Thanks.