diff --git a/CHANGES_NEXT_RELEASE b/CHANGES_NEXT_RELEASE
index 139597f9c..e4601c30d 100644
--- a/CHANGES_NEXT_RELEASE
+++ b/CHANGES_NEXT_RELEASE
@@ -1,2 +1,2 @@
-
+- [cygnus-common][NGSIGenericColumnAggregator] Fix getValue when gson object is null
 
diff --git a/cygnus-ngsi/src/main/java/com/telefonica/iot/cygnus/containers/NotifyContextRequest.java b/cygnus-ngsi/src/main/java/com/telefonica/iot/cygnus/containers/NotifyContextRequest.java
index 829f2f6bb..e4666d761 100644
--- a/cygnus-ngsi/src/main/java/com/telefonica/iot/cygnus/containers/NotifyContextRequest.java
+++ b/cygnus-ngsi/src/main/java/com/telefonica/iot/cygnus/containers/NotifyContextRequest.java
@@ -483,8 +483,10 @@ public String getValue() {
                 return value.getAsJsonObject().toString();
             } else if (value.isJsonArray()) {
                 return value.getAsJsonArray().toString();
-            } else {
+            } else if (!value.isJsonNull()){
                 return "\"" + value.getAsString() + "\"";
+            } else {
+                return "\"" + value.toString() + "\"";
             } // if else if
         } // getValue