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net.sf.json.JSONException: null object at net.sf.json.JSONObject.verifyIsNull(JSONObject.java:2688) at net.sf.json.JSONObject.element(JSONObject.java:1733) at net.sf.json.JSONObject.element(JSONObject.java:1716) at net.sf.json.JSONObject.put(JSONObject.java:2328) at org.jenkinsci.plugins.docker.commons.credentials.DockerRegistryToken$1.call(DockerRegistryToken.java:100) at org.jenkinsci.plugins.docker.commons.credentials.DockerRegistryToken$1.call(DockerRegistryToken.java:71) at hudson.remoting.LocalChannel.call(LocalChannel.java:45) at org.jenkinsci.plugins.docker.commons.credentials.DockerRegistryToken.newKeyMaterialFactory(DockerRegistryToken.java:71) at org.jenkinsci.plugins.docker.commons.credentials.DockerRegistryEndpoint.newKeyMaterialFactory(DockerRegistryEndpoint.java:204) at org.jenkinsci.plugins.docker.commons.credentials.DockerRegistryEndpoint.newKeyMaterialFactory(DockerRegistryEndpoint.java:193) at com.cloudbees.dockerpublish.DockerBuilder$Perform.executeCmd(DockerBuilder.java:381) at com.cloudbees.dockerpublish.DockerBuilder$Perform.executeCmd(DockerBuilder.java:359) at com.cloudbees.dockerpublish.DockerBuilder$Perform.buildAndTag(DockerBuilder.java:305) at com.cloudbees.dockerpublish.DockerBuilder$Perform.exec(DockerBuilder.java:252) at com.cloudbees.dockerpublish.DockerBuilder$Perform.access$100(DockerBuilder.java:233) at com.cloudbees.dockerpublish.DockerBuilder.perform(DockerBuilder.java:208) at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:20) at hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:761) at hudson.model.Build$BuildExecution.build(Build.java:203) at hudson.model.Build$BuildExecution.doRun(Build.java:160) at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:536) at hudson.model.Run.execute(Run.java:1741) at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43) at hudson.model.ResourceController.execute(ResourceController.java:98) at hudson.model.Executor.run(Executor.java:374)