Mar  5 00:02:55.555765 r-tigris-13 ERR snmp#snmp-subagent message repeated 14 times: [ [ax_interface] ERROR: MIBUpdater.start() caught an unexpected exception during update_data()#012Traceback (most recent call last):#012  File "/usr/local/lib/python3.6/dist-packages/ax_interface/mib.py", line 40, in start#012    self.reinit_data()#012  File "/usr/local/lib/python3.6/dist-packages/sonic_ax_impl/mibs/ieee802_1ab.py", line 115, in reinit_data#012    self.loc_chassis_data[b\'lldp_loc_sys_cap_supported\'] = parse_sys_capability(self.loc_chassis_data[b\'lldp_loc_sys_cap_supported\'])#012TypeError: \'NoneType\' object is not subscriptable]\n

Mar  5 00:02:56.427089 r-tigris-13 ERR snmp#snmp-subagent [ax_interface] ERROR: MIBUpdater.start() caught an unexpected exception during update_data()#012Traceback (most recent call last):#012  File "/usr/local/lib/python3.6/dist-packages/ax_interface/mib.py", line 40, in start#012    self.reinit_data()#012  File "/usr/local/lib/python3.6/dist-packages/sonic_ax_impl/mibs/ieee802_1ab.py", line 115, in reinit_data#012    self.loc_chassis_data[b\'lldp_loc_sys_cap_supported\'] = parse_sys_capability(self.loc_chassis_data[b\'lldp_loc_sys_cap_supported\'])#012TypeError: \'NoneType\' object is not subscriptable\n

**Output of `show version`:**

INFO:common.plugins.sanity_check.checks:cmd='show version', output: 

[ 
    "", 
    "SONiC Software Version: SONiC.HEAD.41-69879e4e", 
    "Distribution: Debian 9.12", 
    "Kernel: 4.9.0-9-2-amd64", 
    "Build commit: 69879e4e", 
    "Build date: Tue Feb 25 03:44:22 UTC 2020", 
    "Built by: johnar@jenkins-worker-8", 
    "", 
    "Platform: x86_64-mlnx_msn3800-r0", 
    "HwSKU: ACS-MSN3800", 
    "ASIC: mellanox", 
    "Serial Number: MT1937X00527\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000", 
    "Uptime: 23:50:09 up 15 min,  0 users,  load average: 3.94, 3.73, 2.59", 
    "", 
    "Docker images:", 
    "REPOSITORY                    TAG                 IMAGE ID            SIZE", 
    "docker-syncd-mlnx             HEAD.41-69879e4e    710129be7282        386MB", 
    "docker-syncd-mlnx             latest              710129be7282        386MB", 
    "docker-router-advertiser      HEAD.41-69879e4e    346c753f1a76        287MB", 
    "docker-router-advertiser      latest              346c753f1a76        287MB", 
    "docker-sonic-mgmt-framework   HEAD.41-69879e4e    b5e6121ba1c9        424MB", 
    "docker-sonic-mgmt-framework   latest              b5e6121ba1c9        424MB", 
    "docker-platform-monitor       HEAD.41-69879e4e    81e936164571        629MB", 
    "docker-platform-monitor       latest              81e936164571        629MB", 
    "docker-fpm-frr                HEAD.41-69879e4e    28b3e009ef55        332MB", 
    "docker-fpm-frr                latest              28b3e009ef55        332MB", 
    "docker-sflow                  HEAD.41-69879e4e    4d9fa4eb4860        312MB", 
    "docker-sflow                  latest              4d9fa4eb4860        312MB", 
    "docker-lldp-sv2               HEAD.41-69879e4e    5328e9f7b7e8        309MB", 
    "docker-lldp-sv2               latest              5328e9f7b7e8        309MB", 
    "docker-dhcp-relay             HEAD.41-69879e4e    3e977a20dc55        297MB", 
    "docker-dhcp-relay             latest              3e977a20dc55        297MB", 
    "docker-database               HEAD.41-69879e4e    c0e1d6128f2c        287MB", 
    "docker-database               latest              c0e1d6128f2c        287MB", 
    "docker-teamd                  HEAD.41-69879e4e    f64e1bf4c54e        312MB", 
    "docker-teamd                  latest              f64e1bf4c54e        312MB", 
    "docker-snmp-sv2               HEAD.41-69879e4e    0ac8e5bcb511        344MB", 
    "docker-snmp-sv2               latest              0ac8e5bcb511        344MB", 
    "docker-orchagent              HEAD.41-69879e4e    a0c6d228bfb3        330MB", 
    "docker-orchagent              latest              a0c6d228bfb3        330MB", 
    "docker-nat                    HEAD.41-69879e4e    a9c3c1ecfeb3        313MB", 
    "docker-nat                    latest              a9c3c1ecfeb3        313MB", 
    "docker-sonic-telemetry        HEAD.41-69879e4e    514146abf30c        349MB", 
    "docker-sonic-telemetry        latest              514146abf30c        349MB" 
] 

**Attach debug file `sudo generate_dump`:**