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..a7d9e433d 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