diff --git a/beacon-v2-validator-code/src/main/java/es/bsc/inb/ga4gh/beacon/validator/BeaconEndpointValidator.java b/beacon-v2-validator-code/src/main/java/es/bsc/inb/ga4gh/beacon/validator/BeaconEndpointValidator.java
index 9beec7c..5cf1041 100644
--- a/beacon-v2-validator-code/src/main/java/es/bsc/inb/ga4gh/beacon/validator/BeaconEndpointValidator.java
+++ b/beacon-v2-validator-code/src/main/java/es/bsc/inb/ga4gh/beacon/validator/BeaconEndpointValidator.java
@@ -262,7 +262,7 @@ private AbstractBeaconResponse validateEntryEndpoint(String endpoint,
                 }
                     
                 final JsonObject o = value.asJsonObject().getJsonObject("response");
-                if (o.containsKey("collections")) {
+                if (o != null && o.containsKey("collections")) {
                     return JSONB.fromJson(json, 
                             new BeaconCollectionsResponse<JsonObject>(){}
                                     .getClass().getGenericSuperclass());