diff --git a/src/main/java/DiffLens/back_end/domain/search/converter/SummaryDtoConverter.java b/src/main/java/DiffLens/back_end/domain/search/converter/SummaryDtoConverter.java
index 80d7209..7fc1f06 100644
--- a/src/main/java/DiffLens/back_end/domain/search/converter/SummaryDtoConverter.java
+++ b/src/main/java/DiffLens/back_end/domain/search/converter/SummaryDtoConverter.java
@@ -9,6 +9,7 @@
 import java.time.LocalDate;
 import java.time.format.DateTimeFormatter;
 import java.util.List;
+import java.util.Objects;
 
 @Component
 public class SummaryDtoConverter implements SearchDtoConverter<MainSearchResponse, SearchResponseDTO.SearchResult.Summary, List<PanelWithRawDataDTO>> {
@@ -30,7 +31,9 @@ private int getConfidencePercent(MainSearchResponse response) {
         if (panels.isEmpty()) return 0;
 
         double sum = panels.stream()
-                .mapToDouble(MainSearchResponse.PanelInfo::getSimilarity)
+                .map(MainSearchResponse.PanelInfo::getSimilarity)
+                .filter(Objects::nonNull)
+                .mapToDouble(Double::doubleValue)
                 .sum();
 
         double avg = sum / panels.size();