diff --git a/sunsu-wedding/src/main/java/com/kakao/sunsuwedding/_core/utils/PriceCalculator.java b/sunsu-wedding/src/main/java/com/kakao/sunsuwedding/_core/utils/PriceCalculator.java
index f060ae21..342df2a9 100644
--- a/sunsu-wedding/src/main/java/com/kakao/sunsuwedding/_core/utils/PriceCalculator.java
+++ b/sunsu-wedding/src/main/java/com/kakao/sunsuwedding/_core/utils/PriceCalculator.java
@@ -28,6 +28,7 @@ public static Long calculateConfirmedQuotationPrice(List<Quotation> quotations)
     }
 
     public static Long calculateAvgPrice(List<Match> matches, Long contractCount) {
+        if (contractCount.equals(0L)) return 0L;
         return matches.stream()
                 .filter(match -> match.getStatus().equals(MatchStatus.CONFIRMED))
                 .mapToLong(Match::getConfirmedPrice)
diff --git a/sunsu-wedding/src/main/java/com/kakao/sunsuwedding/portfolio/PortfolioService.java b/sunsu-wedding/src/main/java/com/kakao/sunsuwedding/portfolio/PortfolioService.java
index 4ffec8cd..34b7d34c 100644
--- a/sunsu-wedding/src/main/java/com/kakao/sunsuwedding/portfolio/PortfolioService.java
+++ b/sunsu-wedding/src/main/java/com/kakao/sunsuwedding/portfolio/PortfolioService.java
@@ -129,14 +129,19 @@ public PortfolioResponse.FindByIdDTO getPortfolioById(Long id) {
             throw new NotFoundException(BaseException.PORTFOLIO_NOT_FOUND);
         }
 
+        Portfolio portfolio = imageItems.get(0).getPortfolio();
+        Planner planner = imageItems.get(0).getPortfolio().getPlanner();
+        // 플래너 탈퇴 시 조회 X
+        if (planner == null) {
+            throw new NotFoundException(BaseException.PORTFOLIO_NOT_FOUND);
+        }
+
         List<String> images = imageItems
                 .stream()
                 .map(ImageEncoder::encode)
                 .toList();
 
         List<PriceItem> priceItems = priceItemJPARepository.findAllByPortfolioId(id);
-        Portfolio portfolio = imageItems.get(0).getPortfolio();
-        Planner planner = portfolio.getPlanner();
 
         // 거래 내역 조회를 위한 매칭 내역, 견적서 가져오기
         List<Match> matches = matchJPARepository.findLatestTenByPlanner(planner);