on malformed nts maxtls or mintls in config segfault ensues

Expected behavior is that ntpd should issue a warning. Actual behavior is that it segfaults.
Steps to recreate
put the line nts mintls 1.2 or nts maxtls 1.2 in the NTPsec config file
start ntpd
> sudo ntpsec/build/main/ntpd/ntpd -Nn -D3
2019-03-02T10:43:04 ntpd[191200]: INIT: ntpd ntpsec-1.1.3+ 2019-03-02T17:12:21Z (git rev aded4d954): Starting
2019-03-02T10:43:04 ntpd[191200]: INIT: Command line: ntpsec/build/main/ntpd/ntpd -Nn -D3
2019-03-02T10:43:04 ntpd[191200]: INIT: set_process_priority: Attempt to set priority
2019-03-02T10:43:04 ntpd[191200]: INIT: precision = 0.154 usec (-23)
2019-03-02T10:43:04 ntpd[191200]: INIT: successfully locked into RAM
2019-03-02T10:43:04 ntpd[191200]: CONFIG: readconfig: parsing file: /etc/ntp.conf
2019-03-02T10:43:04 ntpd[191200]: CONFIG: readconfig: parsing directory: /etc/ntp.conf
Finished Parsing!!
configuring filegen:
        dir:    /var/NTP/ -> /var/log/ntpstats/
        fname:  clockstats -> clockstats
        type:   2 -> 2
        flag: 1 -> 1
configuring filegen:
        dir:    /var/NTP/ -> /var/log/ntpstats/
        fname:  loopstats -> loopstats
        type:   2 -> 2
        flag: 1 -> 1
configuring filegen:
        dir:    /var/NTP/ -> /var/log/ntpstats/
        fname:  rawstats -> rawstats
        type:   2 -> 2
        flag: 1 -> 1
configuring filegen:
        dir:    /var/NTP/ -> /var/log/ntpstats/
        fname:  sysstats -> sysstats
        type:   2 -> 2
        flag: 1 -> 1
configuring filegen:
        dir:    /var/NTP/ -> /var/log/ntpstats/
        fname:  peerstats -> peerstats
        type:   2 -> 2
        flag: 1 -> 1
configuring filegen:
        dir:    /var/NTP/ -> /var/log/ntpstats/
        fname:  protostats -> protostats
        type:   2 -> 2
        flag: 1 -> 1
configuring filegen:
        dir:    /var/NTP/ -> /var/log/ntpstats/
        fname:  usestats -> usestats
        type:   2 -> 2
        flag: 1 -> 1
configuring filegen:
        dir:    /var/log/ntpstats/ -> /var/log/ntpstats/
        fname:  loopstats -> loopstats
        type:   2 -> 2
        flag: 1 -> 81
configuring filegen:
        dir:    /var/log/ntpstats/ -> /var/log/ntpstats/
        fname:  peerstats -> peerstats
        type:   2 -> 2
        flag: 1 -> 81
getnetnum given ::, got ::
getnetnum given ::, got ::
restrict: op 1 addr :: mask :: mflags 00000000 flags 000004a0
restrict: op 1 addr 0.0.0.0 mask 0.0.0.0 mflags 00000000 flags 000004a0
restrict: op 1 addr :: mask :: mflags 00000000 flags 000004a0
getnetnum given 127.0.0.1, got 127.0.0.1
restrict: op 1 addr 127.0.0.1 mask 255.255.255.255 mflags 00000000 flags 00000000
getnetnum given 192.168.42.0, got 192.168.42.0
getnetnum given 255.255.255.0, got 255.255.255.0
restrict: op 1 addr 192.168.42.0 mask 255.255.255.0 mflags 00000000 flags 00000000
getnetnum given ::1, got ::1
restrict: op 1 addr ::1 mask ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff mflags 00000000 flags 00000000
getnetnum given fe80::, got fe80::
restrict: op 1 addr fe80:: mask ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff mflags 00000000 flags 00000000
restrict: op 1 addr 0.0.0.0 mask 0.0.0.0 mflags 00000000 flags 000004f0
restrict: op 1 addr :: mask :: mflags 00000000 flags 000004f0
getnetnum given ::, got ::
getnetnum given ::, got ::
restrict: op 1 addr :: mask :: mflags 00000000 flags 000004f0
getnetnum given 127.0.0.1, got 127.0.0.1
restrict: op 1 addr 127.0.0.1 mask 255.255.255.255 mflags 00000000 flags 00000000
getnetnum given ::1, got ::1
restrict: op 1 addr ::1 mask ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff mflags 00000000 flags 00000000
[1]    191199 segmentation fault  sudo ntpsec/build/main/ntpd/ntpd -Nn -D3
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