diff --git a/src/main/kotlin/com/android/trisolarisserver/controller/RoomImages.kt b/src/main/kotlin/com/android/trisolarisserver/controller/RoomImages.kt
index 3874bb5..c2ec4f4 100644
--- a/src/main/kotlin/com/android/trisolarisserver/controller/RoomImages.kt
+++ b/src/main/kotlin/com/android/trisolarisserver/controller/RoomImages.kt
@@ -130,8 +130,9 @@ class RoomImages(
         @RequestParam(required = false, defaultValue = "full") size: String,
         @AuthenticationPrincipal principal: MyPrincipal?
     ): ResponseEntity<FileSystemResource> {
-        requirePrincipal(principal)
-        propertyAccess.requireMember(propertyId, principal!!.userId)
+        if (principal != null) {
+            propertyAccess.requireMember(propertyId, principal.userId)
+        }
         ensureRoom(propertyId, roomId)
 
         val image = roomImageRepo.findByIdAndRoomIdAndPropertyId(imageId, roomId, propertyId)