I got the same problem always when I restarted Jenkins. (Jenkins 1.447.2 and EnvInject 1.60)

ERROR: Failed to record SCM polling
java.lang.NullPointerException
	at java.util.TreeMap.putAll(TreeMap.java:290)
	at org.jenkinsci.plugins.envinject.EnvInjectBuilderContributionAction.buildEnvVars(EnvInjectBuilderContributionAction.java:23)
	at hudson.model.AbstractBuild.getEnvironment(AbstractBuild.java:840)
	at hudson.scm.SubversionSCM.compareRemoteRevisionWith(SubversionSCM.java:1114)
	at hudson.scm.SCM._compareRemoteRevisionWith(SCM.java:356)
	at hudson.scm.SCM.poll(SCM.java:373)
	at hudson.model.AbstractProject.poll(AbstractProject.java:1323)
	at hudson.triggers.SCMTrigger$Runner.runPolling(SCMTrigger.java:420)
	at hudson.triggers.SCMTrigger$Runner.run(SCMTrigger.java:449)
	at hudson.util.SequentialExecutionQueue$QueueEntry.run(SequentialExecutionQueue.java:118)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
	at java.util.concurrent.FutureTask.run(FutureTask.java:138)
	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
	at java.lang.Thread.run(Thread.java:662)

Code changed in jenkins
User: Gregory Boissinot
Path:
src/main/java/org/jenkinsci/plugins/envinject/EnvInjectBuilderContributionAction.java
http://jenkins-ci.org/commit/envinject-plugin/4282ddca174519d902ceb676237a7edbfdc20a8f
Log:
Fix JENKINS-14371

NullPointerEception with envinject-1.62.(EnvInjectBuilderContributionAction.java:24)

ERROR: Failed to record SCM polling
java.lang.NullPointerException
at java.util.TreeMap.putAll(TreeMap.java:290)
at org.jenkinsci.plugins.envinject.EnvInjectBuilderContributionAction.buildEnvVars(EnvInjectBuilderContributionAction.java:24)
at hudson.model.AbstractBuild.getEnvironment(AbstractBuild.java:840)
at hudson.scm.SubversionSCM.compareRemoteRevisionWith(SubversionSCM.java:1114)
at hudson.scm.SCM._compareRemoteRevisionWith(SCM.java:356)
at hudson.scm.SCM.poll(SCM.java:373)
at hudson.model.AbstractProject.poll(AbstractProject.java:1323)
at hudson.triggers.SCMTrigger$Runner.runPolling(SCMTrigger.java:420)
at hudson.triggers.SCMTrigger$Runner.run(SCMTrigger.java:449)
at hudson.util.SequentialExecutionQueue$QueueEntry.run(SequentialExecutionQueue.java:118)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:662)

According to the stack trace, it is not possible to be append with the source of EnvInject 1.62. Therefore, it should be a version mistaken.
Please check you are using the right version.

The new crash happens on line 24 of EnvInjectBuilderContributionAction and this is consistent with the latest source in git.

I think the problem might be that resultVariables is null or contains a null key. The crash happens inside of putAll so envVars must be non-null. The javadoc for putAll does state that it will raise NPE if it is null or contains a null key.

http://docs.oracle.com/javase/6/docs/api/java/util/TreeMap.html#putAll%28java.util.Map%29

Agreed with Richard - bug is still alive, and it has to do with resultVariables.

Gregory, if it helps, we also see this during a promotion job - stack is slightly different (originating from the SVNTag plugin) but last few calls are the same:

build hudson.tasks.BatchFile@7844e5f5 SUCCESS
FATAL: null
ha:AAAAWB+LCAAAAAAAAABb85aBtbiIQSmjNKU4P08vOT+vOD8nVc8DzHWtSE4tKMnMz/PLL0ldFVf2c+b/lb5MDAwVRQxSaBqcITRIIQMEMIIUFgAAckCEiWAAAAA=java.lang.NullPointerException
	at java.util.TreeMap.putAll(Unknown Source)
	at org.jenkinsci.plugins.envinject.EnvInjectBuilderContributionAction.buildEnvVars(EnvInjectBuilderContributionAction.java:24)
	at hudson.model.AbstractBuild.getEnvironment(AbstractBuild.java:867)
	at hudson.plugins.svn_tag.SvnTagPlugin.perform(SvnTagPlugin.java:87)
	at hudson.plugins.svn_tag.SvnTagPublisher.perform(SvnTagPublisher.java:79)
	at hudson.plugins.promoted_builds.Promotion$RunnerImpl.build(Promotion.java:158)
	at hudson.plugins.promoted_builds.Promotion$RunnerImpl.doRun(Promotion.java:127)
	at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:499)
	at hudson.model.Run.execute(Run.java:1488)
	at hudson.model.Run.run(Run.java:1434)
	at hudson.plugins.promoted_builds.Promotion.run(Promotion.java:102)
	at hudson.model.ResourceController.execute(ResourceController.java:88)
	at hudson.model.Executor.run(Executor.java:236)