diff --git a/SodaLive/Sources/Content/Create/ContentCreateViewModel.swift b/SodaLive/Sources/Content/Create/ContentCreateViewModel.swift
index f043e06..e02627b 100644
--- a/SodaLive/Sources/Content/Create/ContentCreateViewModel.swift
+++ b/SodaLive/Sources/Content/Create/ContentCreateViewModel.swift
@@ -75,8 +75,8 @@ final class ContentCreateViewModel: ObservableObject {
                 themeId: theme!.id,
                 isAdult: isAdult,
                 isCommentAvailable: isAvailableComment,
-                previewStartTime: previewStartTime,
-                previewEndTime: previewEndTime
+                previewStartTime: previewStartTime.trimmingCharacters(in: .whitespacesAndNewlines).count > 0 ? previewStartTime : nil,
+                previewEndTime: previewEndTime.trimmingCharacters(in: .whitespacesAndNewlines).count > 0 ? previewEndTime : nil
             )
             
             var multipartData = [MultipartFormData]()
diff --git a/SodaLive/Sources/Content/Create/CreateAudioContentRequest.swift b/SodaLive/Sources/Content/Create/CreateAudioContentRequest.swift
index 458b18c..a47b918 100644
--- a/SodaLive/Sources/Content/Create/CreateAudioContentRequest.swift
+++ b/SodaLive/Sources/Content/Create/CreateAudioContentRequest.swift
@@ -15,6 +15,6 @@ struct CreateAudioContentRequest: Encodable {
     let themeId: Int
     let isAdult: Bool
     let isCommentAvailable: Bool
-    let previewStartTime: String
-    let previewEndTime: String
+    let previewStartTime: String?
+    let previewEndTime: String?
 }