Cluster ID "68ed60: JSON plugin error in Logstash 5 but no error in Logstash 2.3

We got this error "JSON parse error, original data now in message field {:error=>#<LogStash::Json::ParserError: Unexpected character ('-' (code 45))"

after upgrade to Logstash 5.0.1 but not happen in 2.3

What does the event look like?