Index: plugins/jmeter/src/main/java/hudson/plugins/jmeter/JMeterProjectAction.java
===================================================================
--- plugins/jmeter/src/main/java/hudson/plugins/jmeter/JMeterProjectAction.java	(revision 22488)
+++ plugins/jmeter/src/main/java/hudson/plugins/jmeter/JMeterProjectAction.java	(working copy)
@@ -175,10 +175,12 @@
 						currentBuild);
 				JMeterBuildAction jmeterBuildAction = currentBuild
 						.getAction(JMeterBuildAction.class);
-				JMeterReport jmeterReport = jmeterBuildAction.getJmeterReport();
-				dataSetBuilderErrors.add(((double) jmeterReport.countErrors())
-						/ jmeterReport.size() * 100, "errors", label);
-
+				// is null, if older builds not configured with jmeter
+				if (jmeterBuildAction != null) {
+					JMeterReport jmeterReport = jmeterBuildAction.getJmeterReport();
+					dataSetBuilderErrors.add(((double) jmeterReport.countErrors())
+							/ jmeterReport.size() * 100, "errors", label);
+				}
 			}
 		}
 
@@ -209,11 +211,14 @@
 						currentBuild);
 				JMeterBuildAction jmeterBuildAction = currentBuild
 						.getAction(JMeterBuildAction.class);
-				JMeterReport jmeterReport = jmeterBuildAction.getJmeterReport();
-				dataSetBuilderAverage.add(jmeterReport.getMax(), "max", label);
-				dataSetBuilderAverage.add(jmeterReport.getAverage(), "average",
-						label);
-				dataSetBuilderAverage.add(jmeterReport.getMin(), "min", label);
+					// is null, if older builds not configured with jmeter
+					if (jmeterBuildAction != null) {
+					JMeterReport jmeterReport = jmeterBuildAction.getJmeterReport();
+					dataSetBuilderAverage.add(jmeterReport.getMax(), "max", label);
+					dataSetBuilderAverage.add(jmeterReport.getAverage(), "average",
+							label);
+					dataSetBuilderAverage.add(jmeterReport.getMin(), "min", label);
+				}
 
 			}
 		}