diff --git a/be/issue/src/main/java/codesquad/issueTracker/issue/controller/IssueController.java b/be/issue/src/main/java/codesquad/issueTracker/issue/controller/IssueController.java
index 41188b18e..fa1818ead 100644
--- a/be/issue/src/main/java/codesquad/issueTracker/issue/controller/IssueController.java
+++ b/be/issue/src/main/java/codesquad/issueTracker/issue/controller/IssueController.java
@@ -22,7 +22,7 @@ public class IssueController {
     private final IssueService issueService;
 
     @GetMapping("/issues")
-    public ApiResponse<IssueFilteredResponseDto> getIssues(@RequestParam String status,
+    public ApiResponse<IssueFilteredResponseDto> getIssues(@RequestParam(defaultValue = "open") String status,
                                                            @RequestParam(required = false) List<Long> labels,
                                                            @RequestParam(required = false) Long milestone,
                                                            @RequestParam(required = false) Long writer,
diff --git a/be/issue/src/main/java/codesquad/issueTracker/issue/service/IssueService.java b/be/issue/src/main/java/codesquad/issueTracker/issue/service/IssueService.java
index 6ea7eb362..3c152ec41 100644
--- a/be/issue/src/main/java/codesquad/issueTracker/issue/service/IssueService.java
+++ b/be/issue/src/main/java/codesquad/issueTracker/issue/service/IssueService.java
@@ -60,7 +60,9 @@ public IssueFilteredResponseDto findByFilter(IssueSearch issueSearch) {
 
     @Transactional
     public Long save(IssueWriteRequestDto request, Long id) {
-        milestoneService.isExistMilestone(request.getMilestoneId());
+        if (request.getMilestoneId() != null) {
+            milestoneService.isExistMilestone(request.getMilestoneId());
+        }
         List<Long> labels = request.getLabels();
         List<Long> assignees = request.getAssignees();
         Issue issue = IssueWriteRequestDto.toEntity(request, id);