diff --git a/Mastodon/Scene/Compose/TableViewCell/ComposeStatusContentTableViewCell.swift b/Mastodon/Scene/Compose/TableViewCell/ComposeStatusContentTableViewCell.swift
index c9c8fa4f..4c3d3716 100644
--- a/Mastodon/Scene/Compose/TableViewCell/ComposeStatusContentTableViewCell.swift
+++ b/Mastodon/Scene/Compose/TableViewCell/ComposeStatusContentTableViewCell.swift
@@ -161,7 +161,10 @@ extension ComposeStatusContentTableViewCell: UITextViewDelegate {
         logger.debug("\((#file as NSString).lastPathComponent, privacy: .public)[\(#line, privacy: .public)], \(#function, privacy: .public): text: \(textView.text ?? "<nil>")")
         guard textView === statusContentWarningEditorView.textView else { return }
         // replace line break with space
-        textView.text = textView.text.replacingOccurrences(of: "\n", with: " ")
+        // needs check input state to prevent break the IME
+        if textView.markedTextRange == nil {
+            textView.text = textView.text.replacingOccurrences(of: "\n", with: " ")
+        }
         contentWarningContent.send(textView.text)
     }
 
diff --git a/ShareActionExtension/Scene/View/StatusEditorView.swift b/ShareActionExtension/Scene/View/StatusEditorView.swift
index c945874e..595057fa 100644
--- a/ShareActionExtension/Scene/View/StatusEditorView.swift
+++ b/ShareActionExtension/Scene/View/StatusEditorView.swift
@@ -81,7 +81,10 @@ public struct StatusEditorView: UIViewRepresentable {
         }
 
         public func textViewDidChange(_ textView: UITextView) {
-            parent.string = textView.text
+            // prevent break IME input
+            if textView.markedTextRange == nil {
+                parent.string = textView.text
+            }
         }
 
         func updateLayout(width: CGFloat) {