From 33eb0a833ec1867fc368f116230ea7bc42733e71 Mon Sep 17 00:00:00 2001
From: osulzhenko <osulzhenko@magnite.com>
Date: Mon, 6 Apr 2026 18:29:32 +0300
Subject: [PATCH 1/2] IX adapter: Handle missing interstitial formats in IX
 adapter

---
 .../org/prebid/server/bidder/ix/IxBidder.java | 11 +++++---
 .../prebid/server/bidder/ix/IxBidderTest.java | 26 +++++++++++++++++++
 2 files changed, 33 insertions(+), 4 deletions(-)

diff --git a/src/main/java/org/prebid/server/bidder/ix/IxBidder.java b/src/main/java/org/prebid/server/bidder/ix/IxBidder.java
index 5770772c1bd..6f8261aa554 100644
--- a/src/main/java/org/prebid/server/bidder/ix/IxBidder.java
+++ b/src/main/java/org/prebid/server/bidder/ix/IxBidder.java
@@ -19,6 +19,7 @@
 import com.iab.openrtb.response.Response;
 import com.iab.openrtb.response.SeatBid;
 import org.apache.commons.collections4.CollectionUtils;
+import org.apache.commons.collections4.ListUtils;
 import org.apache.commons.lang3.StringUtils;
 import org.prebid.server.bidder.Bidder;
 import org.prebid.server.bidder.ix.model.response.IxBidResponse;
@@ -142,16 +143,18 @@ private UpdateResult<Banner> modifyImpBanner(Banner banner) {
         if (banner == null) {
             return UpdateResult.unaltered(null);
         }
-
-        final List<Format> formats = banner.getFormat();
+        final List<Format> formats = ListUtils.emptyIfNull(banner.getFormat()).stream()
+                .filter(Objects::nonNull)
+                .toList();
         final Integer w = banner.getW();
         final Integer h = banner.getH();
+        final boolean hasNoFormats = CollectionUtils.isEmpty(formats);
 
-        if (CollectionUtils.isEmpty(formats) && h != null && w != null) {
+        if (hasNoFormats && h != null && w != null) {
             final List<Format> newFormats = Collections.singletonList(Format.builder().w(w).h(h).build());
             final Banner modifiedBanner = banner.toBuilder().format(newFormats).build();
             return UpdateResult.updated(modifiedBanner);
-        } else if (formats.size() == 1) {
+        } else if (!hasNoFormats && formats.size() == 1) {
             final Format format = formats.getFirst();
             final Banner modifiedBanner = banner.toBuilder().w(format.getW()).h(format.getH()).build();
             return UpdateResult.updated(modifiedBanner);
diff --git a/src/test/java/org/prebid/server/bidder/ix/IxBidderTest.java b/src/test/java/org/prebid/server/bidder/ix/IxBidderTest.java
index 051077ab03e..f1138e83133 100644
--- a/src/test/java/org/prebid/server/bidder/ix/IxBidderTest.java
+++ b/src/test/java/org/prebid/server/bidder/ix/IxBidderTest.java
@@ -148,6 +148,32 @@ public void makeHttpRequestsShouldSetImpBannerFormatsToFormatWithWidthAndHeightI
                 .containsExactly(expectedBanner);
     }
 
+    @Test
+    public void makeHttpRequestsShouldSetImpBannerFormatsToFormatWithWidthAndHeightIfFormatsAreNullList() {
+        // given
+        final BidRequest bidRequest = givenBidRequest(
+                impBuilder -> impBuilder
+                        .banner(Banner.builder().w(1).h(2).format(null).build())
+                        .ext(givenImpExt(null, null)));
+
+        // when
+        final Result<List<HttpRequest<BidRequest>>> result = target.makeHttpRequests(bidRequest);
+
+        // then
+        assertThat(result.getErrors()).isEmpty();
+        final Banner expectedBanner = Banner.builder()
+                .w(1)
+                .h(2)
+                .format(singletonList(Format.builder().w(1).h(2).build()))
+                .build();
+
+        assertThat(result.getValue())
+                .extracting(HttpRequest::getPayload)
+                .flatExtracting(BidRequest::getImp)
+                .extracting(Imp::getBanner)
+                .containsExactly(expectedBanner);
+    }
+
     @Test
     public void makeHttpRequestsShouldSetImpBannerWidthAndHeightIfTheyAreAbsentAndBannerHasOnlyOneFormat() {
         // given

From 979ae601da28fdee6cadd872c3c3d7c268bf8f29 Mon Sep 17 00:00:00 2001
From: osulzhenko <osulzhenko@magnite.com>
Date: Wed, 8 Apr 2026 20:37:45 +0300
Subject: [PATCH 2/2] Update after review

---
 src/main/java/org/prebid/server/bidder/ix/IxBidder.java | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/src/main/java/org/prebid/server/bidder/ix/IxBidder.java b/src/main/java/org/prebid/server/bidder/ix/IxBidder.java
index 6f8261aa554..fcfc8a729a3 100644
--- a/src/main/java/org/prebid/server/bidder/ix/IxBidder.java
+++ b/src/main/java/org/prebid/server/bidder/ix/IxBidder.java
@@ -19,7 +19,6 @@
 import com.iab.openrtb.response.Response;
 import com.iab.openrtb.response.SeatBid;
 import org.apache.commons.collections4.CollectionUtils;
-import org.apache.commons.collections4.ListUtils;
 import org.apache.commons.lang3.StringUtils;
 import org.prebid.server.bidder.Bidder;
 import org.prebid.server.bidder.ix.model.response.IxBidResponse;
@@ -143,9 +142,8 @@ private UpdateResult<Banner> modifyImpBanner(Banner banner) {
         if (banner == null) {
             return UpdateResult.unaltered(null);
         }
-        final List<Format> formats = ListUtils.emptyIfNull(banner.getFormat()).stream()
-                .filter(Objects::nonNull)
-                .toList();
+
+        final List<Format> formats = banner.getFormat();
         final Integer w = banner.getW();
         final Integer h = banner.getH();
         final boolean hasNoFormats = CollectionUtils.isEmpty(formats);