Null Pointer Exceptions when using anyOf/oneOf/allOf

When using anyOf, oneOf, or allOf in v2.0.9, I get a NullPointerException when trying to read the specification.

File I've been using to reproduce:

{
  "openapi": "3.0.0",
  "info": {
    "description": "Some API",
    "version": "0.0.1",
    "title": "Some Title",
    "contact": {
      "name": "me",
      "url": "https://suhdude.com",
      "email": "nowhere@nowhere.com"
    },
    "license": {
      "name": "Apache 2.0",
      "url": "http://www.apache.org/licenses/LICENSE-2.0.html"
    }
  },
  "tags": [
    {
      "name": "Something",
      "description": "API that does something"
    }
  ],
  "paths": {
    "/some-path": {
      "post": {
        "summary": "Do something",
        "description": "Does something",
        "operationId": "someOperation",
        "tags": [
          "something"
        ],
        "requestBody": {
          "content": {
            "application/json": {
              "schema": {
                "$ref": "#/components/schemas/SomeRequest"
              }
            }
          }
        },
        "responses": {
          "200": {
            "description": "OK",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/SomeResponse"
                }
              }
            }
          }
        }
      }
    }
  },
  "components": {
    "schemas": {
      "SomeResponse": {
        "type": "object",
        "description": "Some response",
        "properties": {
          "message": {
            "type": "string",
            "description": "Some message"
          }
        }
      },
      "SomeRequest": {
        "type": "object",
        "description": "Some request",
        "properties": {
          "regularType": {
            "type": "string",
            "description": "Simple type works",
            "default": "some message"
          },
          "someOfType": {
            "oneOf": [
              {
                "type": "string"
              },
              {
                "type": "integer"
              }
            ],
            "description": "this breaks using oneOf/anyOf/etc.",
            "default": 10
          }
        }
      }
    }
  }
}

Just parsing/debugging with this:

package com.somewhere;

import io.swagger.v3.oas.models.OpenAPI;
import io.swagger.v3.parser.OpenAPIV3Parser;

public class Main {

	public static void main(String[] args) {
		OpenAPI openAPI = new OpenAPIV3Parser().read(Main.class.getClassLoader().getResource("some-spec.json").getFile());
	}
}

This same code parses the swagger file just fine on v2.0.8.

It seems to throw the error at some point in the getSchema method of the OpenAPIDeserializer.java file when attempting to parse the components. I noticed after a bit of debugging that after several calls to the getSchema method, the node it attempts to get a schema for {"oneOf":[{"type":"string"},{"type":"integer"}],"description":"this breaks using oneOf/anyOf/etc.","default":10} and it correctly identifies the oneOfArray as [{"type":"string"},{"type":"integer"}], but when it attempts to call getType() on the schema (ComposedSchema) at line 2260 it returns null and causes the NPE.

Reproduce the failure with the supplied OpenAPI JSON and Java parsing snippet, then inspect getSchema in OpenAPIDeserializer.java around line 2260. Trace how the oneOf/anyOf/allOf schema is represented and identify why getType() leads to the NullPointerException. Done means the supplied specification parses without an exception, as it did with v2.0.8.