Unable to parse JsonPredicate

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When adding trigger for in-app automation based on custom event, I receive JSON containing empty predicate which results with parsing error. Here is the problematic part of JSON:

"triggers":[
  {
    "predicate":{
      "or":[
        {
          "and":[
            {
              "ignore_case":true,
              "value":{
                "equals":"home_visit"
              },
              "key":"event_name"
            },
            {
              "and":[]
            }
          ]
        }
      ]
    },
    "goal":1,
    "type":"custom_event_count"
  }
]

The error that occurs:

Caused by: java.lang.IllegalArgumentException: Predicate must contain at least 1 matcher or child predicate.
at com.urbanairship.json.JsonPredicate$Builder.build(JsonPredicate.java:231)

It occurs on this empty "and"