[JENKINS-11592] trying to find out where the NPE is originated

core/src/main/java/hudson/model/Run.java

@@ -1816,6 +1816,8 @@ public abstract class Run <JobT extends Job<JobT,RunT>,RunT extends Run<JobT,Run
      * <p>
      * Unlike earlier {@link #getEnvVars()}, this map contains the whole environment,
      * not just the overrides, so one can introspect values to change its behavior.
+     * 
+     * @return the map with the environmental variables. Never <code>null</code>.
      * @since 1.305
      */
     public EnvVars getEnvironment(TaskListener log) throws IOException, InterruptedException {

maven-plugin/src/main/java/hudson/maven/MavenModuleSetBuild.java

@@ -46,6 +46,7 @@ import hudson.model.Computer;
 import hudson.model.Environment;
 import hudson.model.Executor;
 import hudson.model.Fingerprint;
+import hudson.model.Node;
 import hudson.model.ParameterDefinition;
 import hudson.model.ParametersAction;
 import hudson.model.ParametersDefinitionProperty;
@@ -162,8 +163,15 @@ public class MavenModuleSetBuild extends AbstractMavenBuild<MavenModuleSet,Maven
         if (mvn == null)
             throw new AbortException(Messages.MavenModuleSetBuild_NoMavenConfigured());
 
-        mvn = mvn.forEnvironment(envs).forNode(
-                Computer.currentComputer().getNode(), log);
+        
+        mvn = mvn.forEnvironment(envs);
+        Node node = Computer.currentComputer().getNode();
+        if (node == null) {
+            log.getLogger().println("WARNING: cannot get current node: "+Computer.currentComputer());
+            return envs;
+        }
+        mvn = mvn.forNode(node, log);
+        
         envs.put("M2_HOME", mvn.getHome());
         envs.put("PATH+MAVEN", mvn.getHome() + "/bin");
         return envs;