update commit status error 422

[Chrislevi]

Until few days ago, the plugin managed to update commit status just fine
there were no changes made to Jenkins before the error rose up. the Error indicates that the target_url is invalid, it didnt change and the URL seems like a valid one. Any leads on this issue or similar behavior?

Setting status of XXXX to SUCCESS with url nulljob/GitHub-XXX/7/ and message: 'SUCCESS
 '
Could not update commit status of the Pull Request on GitHub.
org.kohsuke.github.HttpException: {"message":"Validation Failed","errors":[{"resource":"Status","code":"custom","field":"target_url","message":"target_url must use http(s) scheme"}],"documentation_url":"https://developer.github.com/v3/repos/statuses/#create-a-status"}
	at org.kohsuke.github.Requester.handleApiError(Requester.java:664)
	at org.kohsuke.github.Requester._to(Requester.java:285)
	at org.kohsuke.github.Requester.to(Requester.java:226)
	at org.kohsuke.github.GHRepository.createCommitStatus(GHRepository.java:1000)
	at org.jenkinsci.plugins.ghprb.extensions.status.GhprbSimpleStatus.createCommitStatus(GhprbSimpleStatus.java:272)
	at org.jenkinsci.plugins.ghprb.extensions.status.GhprbSimpleStatus.onBuildComplete(GhprbSimpleStatus.java:231)
	at org.jenkinsci.plugins.ghprb.GhprbBuilds.onCompleted(GhprbBuilds.java:192)
	at org.jenkinsci.plugins.ghprb.GhprbBuildListener.onCompleted(GhprbBuildListener.java:26)
	at hudson.model.listeners.RunListener.fireCompleted(RunListener.java:211)
	at org.jenkinsci.plugins.workflow.job.WorkflowRun.finish(WorkflowRun.java:664)
	at org.jenkinsci.plugins.workflow.job.WorkflowRun.access$1400(WorkflowRun.java:135)
	at org.jenkinsci.plugins.workflow.job.WorkflowRun$GraphL.onNewHead(WorkflowRun.java:967)
	at org.jenkinsci.plugins.workflow.cps.CpsFlowExecution.notifyListeners(CpsFlowExecution.java:1212)
	at org.jenkinsci.plugins.workflow.cps.CpsThreadGroup$3.run(CpsThreadGroup.java:407)
	at org.jenkinsci.plugins.workflow.cps.CpsVmExecutorService$1.run(CpsVmExecutorService.java:35)
	at hudson.remoting.SingleLaneExecutorService$1.run(SingleLaneExecutorService.java:112)
	at jenkins.util.ContextResettingExecutorService$1.run(ContextResettingExecutorService.java:28)
	at java.util.concurrent.Executors$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: org.kohsuke.github.HttpException: Server returned HTTP response code: 422, message: 'Unprocessable Entity' for URL: https://api.github.com/repos/XXX/XXX/statuses/COMMITHASH
	at org.kohsuke.github.Requester.parse(Requester.java:622)
	at org.kohsuke.github.Requester.parse(Requester.java:584)
	at org.kohsuke.github.Requester._to(Requester.java:264)
	... 20 more
Caused by: java.io.IOException: Server returned HTTP response code: 422 for URL: https://api.github.com/repos/XXX/XXX/statuses/COMMITHASH
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
	at sun.net.www.protocol.http.HttpURLConnection$10.run(HttpURLConnection.java:1926)
	at sun.net.www.protocol.http.HttpURLConnection$10.run(HttpURLConnection.java:1921)
	at java.security.AccessController.doPrivileged(Native Method)
	at sun.net.www.protocol.http.HttpURLConnection.getChainedException(HttpURLConnection.java:1920)
	at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1490)
	at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1474)
	at sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:254)
	at org.kohsuke.github.Requester.parse(Requester.java:602)
	... 22 more
Caused by: java.io.IOException: Server returned HTTP response code: 422 for URL: https://api.github.com/repos/XXX/XXX/statuses/COMMITHASH
	at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1876)
	at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1474)
	at java.net.HttpURLConnection.getResponseCode(HttpURLConnection.java:480)
	at sun.net.www.protocol.https.HttpsURLConnectionImpl.getResponseCode(HttpsURLConnectionImpl.java:338)
	at org.kohsuke.github.Requester.parse(Requester.java:592)
	... 22 more
Finished: SUCCESS

Jenkins 2.75
ghprb 1.39