Index: src/main/java/hudson/plugins/clearcase/AbstractClearCaseScm.java
===================================================================
--- src/main/java/hudson/plugins/clearcase/AbstractClearCaseScm.java	(revision 29887)
+++ src/main/java/hudson/plugins/clearcase/AbstractClearCaseScm.java	(working copy)
@@ -455,6 +455,14 @@
             buildTime = new Date(lastBuildMilliSecs - (1000 * 60 * getMultiSitePollBuffer()));
         }
 
+        // get last build where computer is online HUDSON-6184
+        lastBuild = getLastBuild(project.getBuilds());
+
+        // no computer is online
+        if(lastBuild == null){
+            return true;
+        }
+        
         VariableResolver<String> variableResolver = new BuildVariableResolver((AbstractBuild<?, ?>) lastBuild,
                 getBuildComputer((AbstractBuild<?, ?>) lastBuild));
 
@@ -466,6 +474,25 @@
     }
 
     /**
+     * Get last build where computer is online
+     * 
+     * @param all builds of project
+     * 
+     * @return build where computer ran on is online
+     */
+    private Run<?,?> getLastBuild(List<AbstractBuild<?, ?>> builds){
+        
+        for (AbstractBuild<?, ?> build : builds) {
+            
+            if(build.getBuiltOn().toComputer().isOnline()){
+                return build;
+            }
+        }
+        
+        return null;
+    }
+    
+    /**
      * Creates a Hudson clear tool launcher.
      * 
      * @param listener listener to write command output to