LuCI traceback for syslog: not enough memory

System log:

/usr/lib/lua/luci/dispatcher.lua:460: Failed to execute call dispatcher target for entry ‘/admin/status/syslog’.
The called action terminated with an exception:
not enough memory
stack traceback:
[C]: in function ‘assert’
/usr/lib/lua/luci/dispatcher.lua:460: in function ‘dispatch’
/usr/lib/lua/luci/dispatcher.lua:141: in function </usr/lib/lua/luci/dispatcher.lua:140>

Resolution: reboot. Just restart.