I am really not certain. You could try installing the perl JSON::XS package and see if that fixes this. I am reaching a bit here though. I see that the error is coming from JSON::PP, which is the native JSON backend. If you install JSON::XS it should switch to using that instead. We have seen other issues with using JSON::PP.
Installing JSON::XS (using yum install perl-JSON-XS) on CentOS 7 fixed this particular issue for me.
Thanks Glenn and Danny, now everything works after install JSON::XS using yum install perl-JSON-XS.