diff --git a/src/main/java/mServer/crawler/sender/arte/ArteCategoryFilmListDeserializer.java b/src/main/java/mServer/crawler/sender/arte/ArteCategoryFilmListDeserializer.java
index c1676d879..7484c964e 100644
--- a/src/main/java/mServer/crawler/sender/arte/ArteCategoryFilmListDeserializer.java
+++ b/src/main/java/mServer/crawler/sender/arte/ArteCategoryFilmListDeserializer.java
@@ -41,17 +41,19 @@ public ArteCategoryFilmsDTO deserialize(JsonElement aJsonElement, Type aType, Js
         final JsonObject contentObject = jsonElement.getAsJsonObject().get(JSON_ELEMENT_CONTENT).getAsJsonObject();
         if (contentObject.has(JSON_ELEMENT_DATA)) {
           for(JsonElement dataElement : contentObject.get(JSON_ELEMENT_DATA).getAsJsonArray()) {
-            String programId = dataElement.getAsJsonObject().get(JSON_ELEMENT_PROGRAMID).getAsString();
-            if (programId != null) {
-              if (programId.startsWith("RC-")) {
-                try {
-                  long collectionId = Long.parseLong(programId.replace("RC-", ""));
-                  dto.addCollection(String.format("RC-%06d", collectionId));
-                } catch (NumberFormatException e) {
-                  Log.errorLog(12834939, "Invalid collection id: " + programId);
+            if (!dataElement.getAsJsonObject().get(JSON_ELEMENT_PROGRAMID).isJsonNull()) {
+              String programId = dataElement.getAsJsonObject().get(JSON_ELEMENT_PROGRAMID).getAsString();
+              if (programId != null) {
+                if (programId.startsWith("RC-")) {
+                  try {
+                    long collectionId = Long.parseLong(programId.replace("RC-", ""));
+                    dto.addCollection(String.format("RC-%06d", collectionId));
+                  } catch (NumberFormatException e) {
+                    Log.errorLog(12834939, "Invalid collection id: " + programId);
+                  }
+                } else {
+                  dto.addProgramId(programId);
                 }
-              } else {
-                dto.addProgramId(programId);
               }
             }
           }
diff --git a/src/main/java/mServer/crawler/sender/arte/ArteCategoryFilmsDTO.java b/src/main/java/mServer/crawler/sender/arte/ArteCategoryFilmsDTO.java
index 3d85200de..7cd40a628 100644
--- a/src/main/java/mServer/crawler/sender/arte/ArteCategoryFilmsDTO.java
+++ b/src/main/java/mServer/crawler/sender/arte/ArteCategoryFilmsDTO.java
@@ -1,11 +1,12 @@
 package mServer.crawler.sender.arte;
 
-import java.util.ArrayList;
+import java.util.HashSet;
+import java.util.Set;
 
 public class ArteCategoryFilmsDTO {
 
-  private final ArrayList<String> programIds = new ArrayList<>();
-  private final ArrayList<String> collectionIds = new ArrayList<>();
+  private final Set<String> programIds = new HashSet<>();
+  private final Set<String> collectionIds = new HashSet<>();
 
   private boolean hasNextPage;
 
@@ -16,10 +17,10 @@ public void addCollection(String aCollectionId) {
     collectionIds.add(aCollectionId);
   }
 
-  public ArrayList<String> getProgramIds() {
+  public Set<String> getProgramIds() {
     return programIds;
   }
-  public ArrayList<String> getCollectionIds() {
+  public Set<String> getCollectionIds() {
     return collectionIds;
   }
 
diff --git a/src/test/developTest/java/mServer/crawler/sender/arte/ArteCategoryFilmListDeserializerTest.java b/src/test/developTest/java/mServer/crawler/sender/arte/ArteCategoryFilmListDeserializerTest.java
index 94682da9c..f2c219568 100644
--- a/src/test/developTest/java/mServer/crawler/sender/arte/ArteCategoryFilmListDeserializerTest.java
+++ b/src/test/developTest/java/mServer/crawler/sender/arte/ArteCategoryFilmListDeserializerTest.java
@@ -7,9 +7,9 @@
 import org.junit.runner.RunWith;
 import org.junit.runners.Parameterized;
 
-import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collection;
+import java.util.Set;
 
 import static org.hamcrest.CoreMatchers.equalTo;
 import static org.hamcrest.CoreMatchers.notNullValue;
@@ -45,7 +45,7 @@ public void testDeserialize() {
 
     assertThat(actual, notNullValue());
     assertThat(actual.hasNextPage(), equalTo(expectedHasNextPage));
-    ArrayList<String> actualProgramIds = actual.getProgramIds();
+    Set<String> actualProgramIds = actual.getProgramIds();
     assertThat(actualProgramIds, Matchers.containsInAnyOrder(expectedProgramIds));
   }
 }