diff --git a/src/lib/ngsiNotify/Notifier.cpp b/src/lib/ngsiNotify/Notifier.cpp
index 6fd17245da..fb5070f1ab 100644
--- a/src/lib/ngsiNotify/Notifier.cpp
+++ b/src/lib/ngsiNotify/Notifier.cpp
@@ -292,9 +292,14 @@ static bool setNgsiPayload
   for (unsigned int ix = 0; ix < orderedNgsiAttrs.size(); ix++)
   {
     cer.entity.attributeVector.push_back(new ContextAttribute(orderedNgsiAttrs[ix], false, true));
-    TIME_EXPR_CTXBLD_START();
-    exprContextObjectP->add(orderedNgsiAttrs[ix]->name, orderedNgsiAttrs[ix]->toJsonValue(exprContextObjectP), true);
-    TIME_EXPR_CTXBLD_STOP();
+
+    // Avoid to add context if an attribute with the same name exists in the entity
+    if (cer.entity.attributeVector.get(orderedNgsiAttrs[ix]->name) < 0)
+    {
+      TIME_EXPR_CTXBLD_START();
+      exprContextObjectP->add(orderedNgsiAttrs[ix]->name, orderedNgsiAttrs[ix]->toJsonValue(exprContextObjectP), true);
+      TIME_EXPR_CTXBLD_STOP();
+    }
   }
   // Next, other attributes in the original entity not already added
   for (unsigned int ix = 0; ix < en.attributeVector.size(); ix++)