How to apply an SMT to a single topic in Kafka connect?

I would like to apply a set of SMT (Single Message Transforms) to one single topic.

I have the following configuration..

connector.class: io.debezium.connector.postgresql.PostgresConnector
name: test
database.server.name: testserver
database.hostname: 127.0.0.1
database.port: 5432
database.dbname: test
database.user: testuser
database.password: "testpass"
schema.whitelist: test
table.whitelist: test.topic1, test.topic2, test.topic3
transforms:unwrap,extractTopic1Key,extractTopic1Value,extractTopic2Key
transforms.unwrap.type: io.debezium.transforms.UnwrapFromEnvelope
transforms.unwrap.delete.handling.mode: rewrite
transforms.unwrap.drop.tombstones: false
transforms.extractTopic1Key.type: org.apache.kafka.connect.transforms.ExtractField$Key
transforms.extractTopic1Value.type: org.apache.kafka.connect.transforms.ExtractField$Value
transforms.extractTopic1Key.field: propname
transforms.extractTopic1Value.field: propvalue
transforms.extractTopic1Key.predicate: test_topic1
transforms.extractTopic1Value.predicate: test_topic1
transforms.extractTopic2Key.type:org.apache.kafka.connect.transforms.ExtractField$Key
transforms.extractTopic2Key.field: id
transforms.extractTopic2Key.predicate: test_topic2
predicates=test_topic1,test_topic2
predicates.test_topic1.type=org.apache.kafka.connect.predicates.TopicNameMatches
predicates.test_topic1.pattern=.*topic1
predicates.test_topic2.type=org.apache.kafka.connect.predicates.TopicNameMatches
predicates.test_topic2.pattern=.*topic2
key.converter: org.apache.kafka.connect.json.JsonConverter
key.converter.schemas.enable: false
value.converter: org.apache.kafka.connect.json.JsonConverter
value.converter.schemas.enable: false
decimal.handling.mode: string
include.schema.changes: false
#Adds header which says insert,update,delete
transforms.unwrap.operation.header: true
snapshot.mode: initial
heartbeat.interval.ms: 10000
slot.name: test

I am getting the following error..

org.apache.kafka.connect.errors.ConnectException: Tolerance exceeded in error handler
        at org.apache.kafka.connect.runtime.errors.RetryWithToleranceOperator.execAndHandleError(RetryWithToleranceOperator.java:178)
        at org.apache.kafka.connect.runtime.errors.RetryWithToleranceOperator.execute(RetryWithToleranceOperator.java:104)
        at org.apache.kafka.connect.runtime.TransformationChain.apply(TransformationChain.java:50)
        at org.apache.kafka.connect.runtime.WorkerSourceTask.sendRecords(WorkerSourceTask.java:308)
        at org.apache.kafka.connect.runtime.WorkerSourceTask.execute(WorkerSourceTask.java:234)
        at org.apache.kafka.connect.runtime.WorkerTask.doRun(WorkerTask.java:177)
        at org.apache.kafka.connect.runtime.WorkerTask.run(WorkerTask.java:227)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.NullPointerException
        at org.apache.kafka.connect.transforms.ExtractField.apply(ExtractField.java:61)
        at org.apache.kafka.connect.runtime.TransformationChain.lambda$apply$0(TransformationChain.java:50)
        at org.apache.kafka.connect.runtime.errors.RetryWithToleranceOperator.execAndRetry(RetryWithToleranceOperator.java:128)
        at org.apache.kafka.connect.runtime.errors.RetryWithToleranceOperator.execAndHandleError(RetryWithToleranceOperator.java:162)
        ... 11 more

When I remove the all transformations except unwrap, it is working fine.
My sample topic data looks as follows.

Key

{"propname":"my.test.prop"} 

Value

{"propname":"my.test.prop","propvalue":"10","__deleted":"false"}

propname is the primary key in the table.

What is wrong with the above configuration and how do we apply specific SMTs only to specified topics?

P.S: I am using Confluent Platform 5.3.1

[tag:apache-Kafka] has included supporting for conditionally applying an SMT since 2.6.0 version through KIP-585 - Filter and Conditional SMTs.

You are using Confluent Platform 5.3.1. 5.3.1 is a bugfix release of Confluent Platform that provides you with Apache Kafka 2.3.0, the latest stable version of Kafka.

So you need to upgrade Kafka Connect to 2.6.0 version.