Calling "ods-enforcer backup" crashes the enforcer

When calling "ods-enforcer backup" without any further arguments, the enforcer daemon crashes. It looks like this was introduced in 2.1.13 (which I can't select as version above).

Looks like this happens due to ods_check_command() being called with argv[1] = NULL here: enforcer/src/hsmkey/backup_hsmkeys_cmd.c:232

(gdb) bt
#0 0x00007f029ce5e19c in ?? () from /lib/x86_64-linux-gnu/libc.so.6
#1 0x0000562dd75b0cb7 in ods_check_command (cmd=0x0, scmd=scmd@entry=0x562dd75b3b49 "prepare") at ../../common/cmdhandler.c:627
#2 0x0000562dd756785a in run (context=<optimized out>, argc=<optimized out>, argv=0x7f02800069d0) at ../../../enforcer/src/hsmkey/backup_hsmkeys_cmd.c:232
#3 0x0000562dd75b012d in cmdhandler_perform_command (context=<optimized out>, arg=0x7f028affc570 "backup") at ../../common/cmdhandler.c:198
#4 extract_msg (buflen=1024, context=<optimized out>, exitcode=<synthetic pointer>, pos=<synthetic pointer>, buf=0x7f028affc980 "\002") at ../../common/cmdhandler.c:314
#5 cmdhandler_handle_client_conversation (context=context@entry=0x7f0294002b80) at ../../common/cmdhandler.c:366
#6 0x0000562dd75b04f6 in cmdhandler_accept_client (arg=0x7f0294002b80) at ../../common/cmdhandler.c:400
#7 0x0000562dd75b0e49 in runthread (data=0x7f0294002bb0) at ../../common/janitor.c:318
#8 0x00007f029cd733ec in ?? () from /lib/x86_64-linux-gnu/libc.so.6
#9 0x00007f029cdf3a4c in ?? () from /lib/x86_64-linux-gnu/libc.so.6