diff --git a/src/main/java/com/ffii/tsms/modules/data/service/TeamService.kt b/src/main/java/com/ffii/tsms/modules/data/service/TeamService.kt
index 22c9318..b77ce64 100644
--- a/src/main/java/com/ffii/tsms/modules/data/service/TeamService.kt
+++ b/src/main/java/com/ffii/tsms/modules/data/service/TeamService.kt
@@ -109,6 +109,14 @@ open class TeamService(
         return team
     }
 
+    @Transactional(rollbackFor = [Exception::class])
+    open fun setTeamLeadToNull(id: Long) {
+    val team = teamRepository.findById(id).orElseThrow()
+        team.apply {
+            this.staff = null
+        }
+    }
+
     @Transactional(rollbackFor = [Exception::class])
     open fun setStaffTeamIdToNull(id: Long) {
         val staffList: List<Staff>? = staffsService.findAllByTeamId(id).orElseThrow()
diff --git a/src/main/java/com/ffii/tsms/modules/data/web/TeamController.kt b/src/main/java/com/ffii/tsms/modules/data/web/TeamController.kt
index 66bbcb3..69db653 100644
--- a/src/main/java/com/ffii/tsms/modules/data/web/TeamController.kt
+++ b/src/main/java/com/ffii/tsms/modules/data/web/TeamController.kt
@@ -54,6 +54,7 @@ class TeamController(
     @DeleteMapping("/delete/{id}")
     @ResponseStatus(HttpStatus.NO_CONTENT)
     fun delete(@PathVariable id: Long) {
+        teamService.setTeamLeadToNull(id)
         teamService.markDelete(id)
         teamService.setStaffTeamIdToNull(id)
     }