Recently, we upgraded Bitbucket server 5.13 to 7.4.1. All automated Bitbucket webhooks jobs stopped triggering. Surprisingly, we are getting below exception in Jenkins logs.

net.sf.json.JSONException: JSONObject["user"] not found.

        at net.sf.json.JSONObject.getString(JSONObject.java:2040)

        at com.cloudbees.jenkins.plugins.BitbucketPayloadProcessor.processPostServicePayload(BitbucketPayloadProcessor.java:178)

        at com.cloudbees.jenkins.plugins.BitbucketPayloadProcessor.processPayload(BitbucketPayloadProcessor.java:42)

        at com.cloudbees.jenkins.plugins.BitbucketHookReceiver.doIndex(BitbucketHookReceiver.java:54)

        at java.lang.invoke.MethodHandle.invokeWithArguments(MethodHandle.java:627)

So we upgraded Bitbucket plugin with 1.1.20 but still getting same issue in Jenkins.