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java.lang.NullPointerException at java.util.TreeMap.getEntry(TreeMap.java:347) at java.util.TreeMap.containsKey(TreeMap.java:232) at jenkinsci.plugin.browseraxis.label.BrowserFinder.checkNodes(BrowserFinder.java:44) at jenkinsci.plugin.browseraxis.label.BrowserFinder.findLabels(BrowserFinder.java:72) at hudson.model.Node.getDynamicLabels(Node.java:309) at hudson.model.Node.getAssignedLabels(Node.java:294) at hudson.model.Slave.<init>(Slave.java:185) at hudson.slaves.AbstractCloudSlave.<init>(AbstractCloudSlave.java:51) at com.github.kostyasha.yad.DockerSlave.<init>(DockerSlave.java:58) at com.github.kostyasha.yad.DockerCloud.provisionWithWait(DockerCloud.java:227) at com.github.kostyasha.yad.DockerCloud.lambda$provision$0(DockerCloud.java:120) at jenkins.util.ContextResettingExecutorService$2.call(ContextResettingExecutorService.java:46) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:745)