diff --git a/src/main/java/org/cbioportal/service/impl/StudyViewColumnarServiceImpl.java b/src/main/java/org/cbioportal/service/impl/StudyViewColumnarServiceImpl.java
index ea715b98652..7d64076e3a2 100644
--- a/src/main/java/org/cbioportal/service/impl/StudyViewColumnarServiceImpl.java
+++ b/src/main/java/org/cbioportal/service/impl/StudyViewColumnarServiceImpl.java
@@ -116,7 +116,7 @@ public List<ClinicalDataCountItem> getClinicalDataCounts(StudyViewFilter studyVi
         
         return calculateMissingNaCountsForClinicalDataCountItems(
             clinicalDataCountItems,
-            filteredAttributes,
+            filteredAttributes.stream().distinct().toList(),
             this.getClinicalAttributeDatatypeMap(),
             studyViewRepository.getFilteredSamplesCount(studyViewFilterContext),
             studyViewRepository.getFilteredPatientCount(studyViewFilterContext)