morningman opened a new issue #3794:
URL: https://github.com/apache/incubator-doris/issues/3794
**Describe the bug**
When FE start, error log in fe.log:
```
2020-06-07 11:10:35,705 ERROR 91 [Daemon.run():118] daemon thread got
exception:
java.lang.NullPointerException: null
at
org.apache.doris.common.util.MasterDaemon.runOneCycle(MasterDaemon.java:45)
~[palo-fe.jar:?]
at org.apache.doris.common.util.Daemon.run(Daemon.java:116)
[palo-fe.jar:?]
```
**To Reproduce**
Not easy to reproduce
**Solution**
This bug is introduced by PR:
Because the CHECKPOINT instance is not initialized before visiting it.
I will make a PR to fix this.
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