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 a7d9e433d..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
@@ -483,7 +483,7 @@ public String getValue() {
                 return value.getAsJsonObject().toString();
             } else if (value.isJsonArray()) {
                 return value.getAsJsonArray().toString();
-            } else if (!value.isJsonNull){
+            } else if (!value.isJsonNull()){
                 return "\"" + value.getAsString() + "\"";
             } else {
                 return "\"" + value.toString() + "\"";