Nothing error where mongodb avent Replica node

[WMP]

+(automongobackup:454): select_secondary_member(): local __return=secondary
+(automongobackup:458): select_secondary_member(): members=($(mongo --quiet --host $DBHOST:$DBPORT --eval 'rs.conf().members.forEach(function(x){ print(x.host) })' $OPTSEC ))
++(automongobackup:458): select_secondary_member(): mongo --quiet --host 127.0.0.1:27017 --eval 'rs.conf().members.forEach(function(x){ print(x.host) })'
^C
root@mondogb:/var/backups/mongodb# mongo --quiet --host 127.0.0.1:27017 --eval 'rs.conf().members.forEach(function(x){ print(x.host) })'
2016-09-06T21:44:29.413+0200 TypeError: Cannot read property 'members' of null
root@mongodb:/var/backups/mongodb#

I havent any inforamtion about this error in logs.