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..fcfc8a729a3 100644
--- a/src/main/java/org/prebid/server/bidder/ix/IxBidder.java
+++ b/src/main/java/org/prebid/server/bidder/ix/IxBidder.java
@@ -146,12 +146,13 @@ private UpdateResult<Banner> modifyImpBanner(Banner banner) {
         final List<Format> formats = banner.getFormat();
         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