eolivelli opened a new issue #9633:
URL: https://github.com/apache/pulsar/issues/9633
**Describe the bug**
I see this NullPointerException on the broker logs while issuing
"`pulsar-admin sinks available-sink`"
I have `functionsWorkerEnabled=false` in _broker.conf_
```
java.lang.NullPointerException
│
│ pulsar-broker at
org.apache.pulsar.broker.admin.impl.SinksBase.sinks(SinksBase.java:53)
~[org.apache.pulsar-pulsar-broker-2.8.0-SNAPSHOT.jar:2.8.0-SNAPSHOT]
│
│ pulsar-broker at
org.apache.pulsar.broker.admin.impl.SinksBase.getSinkList(SinksBase.java:522)
~[org.apache.pulsar-pulsar-broker-2.8.0-SNAPSHOT.jar:2.8.0-SNAPSHOT]
```
We should return a more user friendly error that explain the problem.
Tested on current master on 2.8.0-SNAPSHOT
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