java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at org.springframework.integration.mongodb.store.MongoDbMessageStore$MessageReadingMongoConverter.read(MongoDbMessageStore.java:170)
at org.springframework.data.mongodb.core.MongoTemplate$ReadDbObjectCallback.doWith(MongoTemplate.java:1263)
at org.springframework.data.mongodb.core.MongoTemplate.executeFindOneInternal(MongoTemplate.java:1014)
at org.springframework.data.mongodb.core.MongoTemplate.doFindOne(MongoTemplate.java:829)
at org.springframework.integration.mongodb.store.MongoDbMessageStore.getMessage(MongoDbMessageStore.java:110)

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