diff --git a/packages/ffi-js/package.json b/packages/ffi-js/package.json
index d46cb88a..b762f9a4 100644
--- a/packages/ffi-js/package.json
+++ b/packages/ffi-js/package.json
@@ -1,6 +1,6 @@
 {
     "name": "cn-font-split",
-    "version": "7.0.0-beta.4",
+    "version": "7.0.1",
     "description": "划时代的字体切割工具，CJK与任何字符！支持 otf、ttf、woff2 字体多线程切割，完美地细颗粒度地进行包大小控制。A revolutionary font subetter that supports CJK and any characters! It enables multi-threaded subset of otf, ttf, and woff2 fonts, allowing for precise control over package size.",
     "main": "./dist/node/index.js",
     "module": "./dist/node/index.mjs",
diff --git a/src/lib.rs b/src/lib.rs
index 08cda9a7..94720527 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -12,7 +12,7 @@ fn main_test() {
     use cn_font_utils::{output_file, read_binary_file};
     use log::info;
 
-    let path = "./src/国标宋体.ttf";
+    let path = "./src/白路棒棒手写体.ttf";
     let font_file = read_binary_file(&path).expect("Failed to read file");
     let input = InputTemplate {
         input: font_file,
diff --git a/src/pre_subset/features/gsub.rs b/src/pre_subset/features/gsub.rs
index c2485eee..07a1c95a 100644
--- a/src/pre_subset/features/gsub.rs
+++ b/src/pre_subset/features/gsub.rs
@@ -8,6 +8,7 @@ pub fn analyze_gsub(
     font: &Font,
     font_file: &mut Cursor<&Vec<u8>>,
 ) -> Vec<Vec<u16>> {
+    // 丑陋的多层 unwrap 处理
     let temp: Result<Option<GlyphSubstitution>, std::io::Error> =
         font.take(font_file);
     // 国标宋体，解析就报错，所以干脆先不解析
@@ -15,8 +16,14 @@ pub fn analyze_gsub(
         error!("{}", temp.unwrap_err());
         return vec![vec![]];
     }
+
     // GSUB
-    let data: GlyphSubstitution = temp.unwrap().unwrap();
+    let temp1 = temp.unwrap();
+    if temp1.is_none() {
+        error!("Font without GSUB table");
+        return vec![vec![]];
+    }
+    let data: GlyphSubstitution = temp1.unwrap();
 
     // let mut feature_tags: Vec<&str> = data
     //     .features
diff --git a/src/pre_subset/gen_svg.rs b/src/pre_subset/gen_svg.rs
index 1ce372c5..980ce2ec 100644
--- a/src/pre_subset/gen_svg.rs
+++ b/src/pre_subset/gen_svg.rs
@@ -18,8 +18,13 @@ pub fn gen_svg_from_font_file(file: &[u8], text: &str) -> String {
 pub fn gen_svg_from_ctx(ctx: &mut Context) {
     if let Some(preview) = &ctx.input.preview_image {
         let text = gen_svg(&mut ctx.face, &preview.text);
+        let name = if preview.name == "" {
+            String::from("preview")
+        } else {
+            preview.name.clone()
+        };
         (ctx.callback)(EventMessage::output_data(
-            format!("{}.svg", preview.name).as_str(),
+            format!("{}.svg", name).as_str(),
             text.as_bytes().to_vec(),
         ));
     }