diff --git a/src/main/java/kr/tgwing/tech/project/domain/Project.java b/src/main/java/kr/tgwing/tech/project/domain/Project.java
index 9e59d8f..9e16798 100644
--- a/src/main/java/kr/tgwing/tech/project/domain/Project.java
+++ b/src/main/java/kr/tgwing/tech/project/domain/Project.java
@@ -21,7 +21,8 @@
 @DynamicInsert
 @NoArgsConstructor
 @Table(name= "project")
-public class Project extends BaseEntity {
+public class
+Project extends BaseEntity {
     @Id @GeneratedValue(strategy = GenerationType.IDENTITY)
     @Column(name="project_id")
     private Long id;
diff --git a/src/main/java/kr/tgwing/tech/project/dto/ProjectBriefDTO.java b/src/main/java/kr/tgwing/tech/project/dto/ProjectBriefDTO.java
index 5dd4f0a..90d00da 100644
--- a/src/main/java/kr/tgwing/tech/project/dto/ProjectBriefDTO.java
+++ b/src/main/java/kr/tgwing/tech/project/dto/ProjectBriefDTO.java
@@ -1,5 +1,6 @@
 package kr.tgwing.tech.project.dto;
 
+import kr.tgwing.tech.project.domain.Image;
 import kr.tgwing.tech.project.domain.Project;
 import lombok.AccessLevel;
 import lombok.Builder;
@@ -7,6 +8,7 @@
 import lombok.NoArgsConstructor;
 
 import java.time.LocalDate;
+import java.util.Optional;
 
 @Data
 @NoArgsConstructor(access = AccessLevel.PROTECTED)
@@ -33,13 +35,20 @@ public ProjectBriefDTO(Long id, String title, LocalDate start, LocalDate end, St
     }
 
     public static ProjectBriefDTO of(Project project) {
+        String imgUrl;
+        Optional<Image> first = project.getImageUrls().stream().findFirst();
+        if (first.isEmpty()) {
+            imgUrl = null;
+        } else {
+            imgUrl = first.get().getImageUrl();
+        }
         return ProjectBriefDTO.builder()
                 .id(project.getId())
                 .title(project.getTitle())
                 .start(project.getStartDate())
                 .end(project.getEndDate())
                 .description(project.getDescription())
-                .thumbnail(project.getImageUrls().stream().findFirst().get().getImageUrl())
+                .thumbnail(imgUrl)
                 .devStatus(project.getDevStatus())
                 .devType(project.getDevType())
                 .build();
diff --git a/src/main/java/kr/tgwing/tech/security/config/SecurityConfig.java b/src/main/java/kr/tgwing/tech/security/config/SecurityConfig.java
index 2fecd6f..0bfad4b 100644
--- a/src/main/java/kr/tgwing/tech/security/config/SecurityConfig.java
+++ b/src/main/java/kr/tgwing/tech/security/config/SecurityConfig.java
@@ -101,7 +101,8 @@ public SecurityFilterChain securityFilterChain(HttpSecurity http) throws Excepti
 //                        .hasRole("ADMIN")
                         .requestMatchers("/**")
                         .permitAll()
-                        .anyRequest().authenticated())
+                        .anyRequest().authenticated()
+                )
                 .addFilterBefore(new JwtFilter(jwtUtil), LoginFilter.class)
                 .addFilterAt(new LoginFilter(authenticationManager(authenticationConfiguration), jwtUtil, tempUserRepository),
                         UsernamePasswordAuthenticationFilter.class)
diff --git a/src/main/java/kr/tgwing/tech/security/filter/LoginFilter.java b/src/main/java/kr/tgwing/tech/security/filter/LoginFilter.java
index 6091795..3d7435e 100644
--- a/src/main/java/kr/tgwing/tech/security/filter/LoginFilter.java
+++ b/src/main/java/kr/tgwing/tech/security/filter/LoginFilter.java
@@ -55,7 +55,7 @@ protected void successfulAuthentication(HttpServletRequest request,
                                             HttpServletResponse response,
                                             FilterChain chain,
                                             Authentication authentication) throws IOException {
-    //UserDetailsS
+        //UserDetailsS
         CustomUserDetails customUserDetails = (CustomUserDetails) authentication.getPrincipal();
 
         String username = customUserDetails.getUsername();