diff --git a/src/main/java/org/sophy/sophy/controller/BooktalkController.java b/src/main/java/org/sophy/sophy/controller/BooktalkController.java
index 31273a0..72d7bf5 100644
--- a/src/main/java/org/sophy/sophy/controller/BooktalkController.java
+++ b/src/main/java/org/sophy/sophy/controller/BooktalkController.java
@@ -38,11 +38,12 @@ public class BooktalkController {
     @GetMapping("/search/{booktalkId}/detail")
     @ResponseStatus(HttpStatus.OK)
     @Operation(summary = "북토크 상세 조회")
+    @SecurityRequirement(name = "JWT Auth")
     public ApiResponseDto<BooktalkDetailResponseDto> getBooktalkDetail(
         @Parameter(hidden = true) @AuthenticationPrincipal User user,
         @Parameter(example = "1") @PathVariable("booktalkId") Long booktalkId) {
         return ApiResponseDto.success(SuccessStatus.GET_BOOKTALK_DETAIL_SUCCESS,
-            booktalkService.getBooktalkDetail(user.getUsername(), booktalkId));
+            booktalkService.getBooktalkDetail(user == null ? "" : user.getUsername(), booktalkId));
     }
 
     @GetMapping("/search")
diff --git a/src/main/java/org/sophy/sophy/service/BooktalkService.java b/src/main/java/org/sophy/sophy/service/BooktalkService.java
index 88bfec4..4fd3cbf 100644
--- a/src/main/java/org/sophy/sophy/service/BooktalkService.java
+++ b/src/main/java/org/sophy/sophy/service/BooktalkService.java
@@ -90,10 +90,13 @@ public BooktalkDeleteResponseDto deleteBooktalk(
 
     // 북토크 상세 조회
     public BooktalkDetailResponseDto getBooktalkDetail(String email, Long booktalkId) {
-        Member member = memberRepository.getMemberByEmail(email);
         Booktalk booktalk = booktalkRepository.getBooktalkById(booktalkId);
-        Boolean isApply = member.getUserBookTalkList()
-            .stream().anyMatch(memberBooktalk -> memberBooktalk.getBooktalk().equals(booktalk));
+        boolean isApply = false;
+        if (!email.isEmpty()) {
+            Member member = memberRepository.getMemberByEmail(email);
+            isApply = member.getUserBookTalkList()
+                .stream().anyMatch(memberBooktalk -> memberBooktalk.getBooktalk().equals(booktalk));
+        }
         return BooktalkDetailResponseDto.of(booktalk, isApply);
     }