we recently upgraded Jenkins and It's plugins and we are experiencing an issue with failure to build on git commit events, which prior to the update was working properly. We have confirmed that the issue is this NPE in Jenkins:

Poked SocureService-Dev-Static-Checks
Jan 21, 2015 7:29:18 AM INFO com.cloudbees.jenkins.GitHubWebHook processGitHubPayload
Poked SocureService-Dev-with-tests
Jan 21, 2015 7:29:18 AM INFO com.cloudbees.jenkins.GitHubWebHook processGitHubPayload
Poked SocureService-Production-Patches
Jan 21, 2015 7:29:18 AM INFO com.cloudbees.jenkins.GitHubWebHook processGitHubPayload
Poked stage-service
Jan 21, 2015 7:29:18 AM SEVERE com.cloudbees.jenkins.GitHubPushTrigger$1 runPolling
Failed to record SCM polling
java.lang.NullPointerException
at org.jenkinsci.plugins.chromedriver.EnvironmentContributorImpl.buildEnvironmentFor(EnvironmentContributorImpl.java:23)
at hudson.model.Run.getEnvironment(Run.java:2224)
at hudson.model.AbstractBuild.getEnvironment(AbstractBuild.java:905)
at hudson.maven.AbstractMavenBuild.getEnvironment(AbstractMavenBuild.java:56)
at hudson.maven.MavenModuleSetBuild.getEnvironment(MavenModuleSetBuild.java:167)
at hudson.plugins.git.GitSCM.compareRemoteRevisionWithImpl(GitSCM.java:563)
at hudson.plugins.git.GitSCM.compareRemoteRevisionWith(GitSCM.java:525)
at hudson.scm.SCM.compareRemoteRevisionWith(SCM.java:380)
at hudson.scm.SCM.poll(SCM.java:397)
at hudson.model.AbstractProject._poll(AbstractProject.java:1441)
at hudson.model.AbstractProject.poll(AbstractProject.java:1344)
at com.cloudbees.jenkins.GitHubPushTrigger$1.runPolling(GitHubPushTrigger.java:81)
at com.cloudbees.jenkins.GitHubPushTrigger$1.run(GitHubPushTrigger.java:106)
at hudson.util.SequentialExecutionQueue$QueueEntry.run(SequentialExecutionQueue.java:118)
at jenkins.util.ContextResettingExecutorService$1.run(ContextResettingExecutorService.java:28)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask.run(FutureTask.java:262)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:744)