hugegraph-core/src/main/java/org/apache/hugegraph/schema/builder/VertexLabelBuilder.java [574:594]:
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    private void checkUserdata(Action action) {
        switch (action) {
            case INSERT:
            case APPEND:
                for (Map.Entry<String, Object> e : this.userdata.entrySet()) {
                    if (e.getValue() == null) {
                        throw new NotAllowException(
                                  "Not allowed pass null userdata value when " +
                                  "create or append edge label");
                    }
                }
                break;
            case ELIMINATE:
            case DELETE:
                // pass
                break;
            default:
                throw new AssertionError(String.format(
                          "Unknown schema action '%s'", action));
        }
    }
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hugegraph-core/src/main/java/org/apache/hugegraph/schema/builder/EdgeLabelBuilder.java [596:616]:
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    private void checkUserdata(Action action) {
        switch (action) {
            case INSERT:
            case APPEND:
                for (Map.Entry<String, Object> e : this.userdata.entrySet()) {
                    if (e.getValue() == null) {
                        throw new NotAllowException(
                                  "Not allowed pass null userdata value when " +
                                  "create or append edge label");
                    }
                }
                break;
            case ELIMINATE:
            case DELETE:
                // pass
                break;
            default:
                throw new AssertionError(String.format(
                          "Unknown schema action '%s'", action));
        }
    }
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