bobby-richard-sed

**Describe the bug(Please use English)** Initial snapshot works fine. Eventually after the snapshot is finished the connector crashes with this exception: java.lang.NullPointerException at org.apache.flink.util.Preconditions.checkNotNull(Preconditions.java:59) at com.ververica.cdc.connectors.mongodb.table.MongoDBConnectorDeserializationSchema.deserialize(MongoDBConnectorDeserializationSchema.java:122) at com.ververica.cdc.debezium.internal.DebeziumChangeFetcher.handleBatch(DebeziumChangeFetcher.java:229) at com.ververica.cdc.debezium.internal.DebeziumChangeFetcher.runFetchLoop(DebeziumChangeFetcher.java:163)...