VerneMQ 1.2.3 crash on SSL stuff

crash.log

2018-01-24 00:01:18 =CRASH REPORT====
  crasher:
    initial call: tls_connection:init/1
    pid: <0.413.0>
    registered_name: []
    exception error: bad argument: [{erlang,binary_to_list,[undefined],[]},{ssl_config,file_error,2,[{file,"ssl_config.erl"},{line,137}]},{ssl_config,init,2,[{file,"ssl_config.erl"},{line,36}]},{ssl_connection,ssl_config,3,[{file,"ssl_connection.erl"},{line,334}]},{tls_connection,init,1,[{file,"tls_connection.erl"},{line,186}]},{proc_lib,init_p_do_apply,3,[{file,"proc_lib.erl"},{line,247}]}]
    ancestors: [tls_connection_sup,ssl_connection_sup,ssl_sup,<0.165.0>]
    messages: [{'$gen_call',{<0.371.0>,#Ref<0.0.2.660>},{new_user,<0.368.0>}}]
    links: [<0.171.0>,#Port<0.9115>]
    dictionary: [{ssl_pem_cache,ssl_pem_cache},{ssl_manager,ssl_manager}]
    trap_exit: true
    status: running
    heap_size: 1598
    stack_size: 27
    reductions: 286
  neighbours: