diff --git a/apps/ai-game-creator-shell/src-tauri/src/ui_editor/commands/separation/workflow.rs b/apps/ai-game-creator-shell/src-tauri/src/ui_editor/commands/separation/workflow.rs
index 771cec10a..da0c9e6b0 100644
--- a/apps/ai-game-creator-shell/src-tauri/src/ui_editor/commands/separation/workflow.rs
+++ b/apps/ai-game-creator-shell/src-tauri/src/ui_editor/commands/separation/workflow.rs
@@ -248,13 +248,12 @@ async fn write_processed_image_inner(processed_url: String, target: PathBuf) ->
         processed_url.chars().count()
     );
     tokio::task::spawn_blocking(move || {
+        let encoded = processed_url
+            .split_once(',')
+            .map(|(_, data)| data)
+            .ok_or_else(|| "处理图 data URL 无效".to_string())?;
         let processed_bytes = base64::engine::general_purpose::STANDARD
-            .decode(
-                processed_url
-                    .split_once(',')
-                    .map(|(_, data)| data)
-                    .unwrap_or_default(),
-            )
+            .decode(encoded)
             .map_err(|error| format!("解析处理图失败：{error}"))?;
         let byte_len = processed_bytes.len();
         fs::write(&target, processed_bytes)