One or more messages from the named source contained a null value for the message state and those messages have been discarded.
Ensure that the system generating the messages for that source is submitting valid messages in a valid format and with valid content.
- Are the messages in valid format?
- Do the messages contain valid content?
- Is the port configuration correct?
- Find the port used by the source by using the view star$sources
- Test the port configuration using the test_port function with a sample message.