No SSL certificate configured, Runtime Exception unable to build keystore

No SSL certificate has been configured on the plugin settings, but the logs show that is trying to build a keystore which gives a runtime exception. The exception is flooding the logs, it comes up to 10 times a day.

Plugin Version: 3.24
Bitbucket Version: 7.0.1
Log trace:
2020-03-04 15:04:45,765 ERROR [threadpool:thread-2] c.a.s.i.c.DefaultTransferableStateManager Error while processing asynchronous task
java.lang.RuntimeException: Unable to build keystore from C:\atlassian\Bitbucket\6.9.2\app
at se.bjurr.prnfb.http.ClientKeyStore.(ClientKeyStore.java:36)
at se.bjurr.prnfb.listener.PrnfbPullRequestEventListener.handleEvent(PrnfbPullRequestEventListener.java:109)
at se.bjurr.prnfb.listener.PrnfbPullRequestEventListener.access$000(PrnfbPullRequestEventListener.java:60)
at se.bjurr.prnfb.listener.PrnfbPullRequestEventListener$2.run(PrnfbPullRequestEventListener.java:178)
at com.atlassian.stash.internal.concurrent.DefaultTransferableStateManager$StateTransferringRunnable.run(DefaultTransferableStateManager.java:166)
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
at java.util.concurrent.FutureTask.run(Unknown Source)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(Unknown Source)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.lang.Thread.run(Unknown Source)
... 1 frame trimmed
Caused by: java.security.KeyStoreException: not found
at java.security.KeyStore.getInstance(Unknown Source)
at se.bjurr.prnfb.http.ClientKeyStore.getKeyStore(ClientKeyStore.java:51)
at se.bjurr.prnfb.http.ClientKeyStore.(ClientKeyStore.java:27)
... 11 common frames omitted
Caused by: java.security.NoSuchAlgorithmException: KeyStore not available
at sun.security.jca.GetInstance.getInstance(Unknown Source)
at java.security.Security.getImpl(Unknown Source)
... 14 common frames omitted