diff --git a/.travis.yml b/.travis.yml
index 2bdddfef6e6..048e6b014cb 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -20,4 +20,4 @@ before_script:
 
 script:
 #  - mvn -e -B clean install && cd hapi-fhir-ra && mvn -e -B -DTRAVIS_JOB_ID=$TRAVIS_JOB_ID clean test jacoco:report coveralls:report
-  - mvn -e -B -P ALLMODULES,NOPARALLEL clean install && cd hapi-fhir-jacoco && mvn -e -B -DTRAVIS_JOB_ID=$TRAVIS_JOB_ID jacoco:report coveralls:report 
+  - mvn -Dci=true -e -B -P ALLMODULES,NOPARALLEL clean install && cd hapi-fhir-jacoco && mvn -e -B -DTRAVIS_JOB_ID=$TRAVIS_JOB_ID jacoco:report coveralls:report 
diff --git a/hapi-fhir-base/src/main/java/ca/uhn/fhir/parser/BaseParser.java b/hapi-fhir-base/src/main/java/ca/uhn/fhir/parser/BaseParser.java
index 17c00535a52..34781546014 100644
--- a/hapi-fhir-base/src/main/java/ca/uhn/fhir/parser/BaseParser.java
+++ b/hapi-fhir-base/src/main/java/ca/uhn/fhir/parser/BaseParser.java
@@ -1075,13 +1075,15 @@ public abstract class BaseParser implements IParser {
 				StringBuilder b = new StringBuilder();
 				b.append(myResDef.getName());
 				return b;
-			} else {
+			} else if (myParent != null) {
 				StringBuilder b = myParent.buildPath();
 				if (b != null && myDef != null) {
 					b.append('.');
 					b.append(myDef.getElementName());
 				}
 				return b;
+			} else {
+				return null;
 			}
 		}
 
diff --git a/hapi-fhir-base/src/main/java/ca/uhn/fhir/util/TestUtil.java b/hapi-fhir-base/src/main/java/ca/uhn/fhir/util/TestUtil.java
index 369bc6f4a10..3820351322f 100644
--- a/hapi-fhir-base/src/main/java/ca/uhn/fhir/util/TestUtil.java
+++ b/hapi-fhir-base/src/main/java/ca/uhn/fhir/util/TestUtil.java
@@ -26,7 +26,12 @@ import java.util.Arrays;
 import java.util.Locale;
 import java.util.TimeZone;
 
+import org.slf4j.LoggerFactory;
+
 import ca.uhn.fhir.context.FhirContext;
+import ch.qos.logback.classic.Level;
+import ch.qos.logback.classic.Logger;
+import ch.qos.logback.classic.LoggerContext;
 
 public class TestUtil {
 	private static final org.slf4j.Logger ourLog = org.slf4j.LoggerFactory.getLogger(TestUtil.class);
@@ -71,6 +76,7 @@ public class TestUtil {
 					}
 				}
 			}
+
 		}
 
 		/*
@@ -94,6 +100,16 @@ public class TestUtil {
 		String timeZone = availableTimeZones[(int)(Math.random() * availableTimeZones.length)];
 		TimeZone.setDefault(TimeZone.getTimeZone(timeZone));
 		ourLog.info("Tests are using time zone: {}", TimeZone.getDefault().getID());
+
+		/*
+		 * If we're running a CI build, set all loggers to TRACE level to ensure coverage
+		 * on trace blocks 
+		 */
+		if ("true".equals(System.getProperty("ci"))) {
+			for (Logger next : ((LoggerContext)LoggerFactory.getILoggerFactory()).getLoggerList()) {
+				next.setLevel(Level.TRACE);
+			}
+		}
 		
 	}
 	
diff --git a/src/changes/changes.xml b/src/changes/changes.xml
index 224a65892ef..4053ff5d039 100644
--- a/src/changes/changes.xml
+++ b/src/changes/changes.xml
@@ -192,6 +192,10 @@
 				required in earlier versions of FHIR but has been removed
 				from the specification.
 			</action>
+			<action type="fix" issue="428">
+				Fix NullPointerException when encoding an extension containing CodeableConcept
+				with log level set to TRACE. Thanks to Bill Denton for the report!
+			</action>
 		</release>
 		<release version="1.6" date="2016-07-07">
 			<action type="fix">