diff --git a/3rdparty/lolly/System/Classes/url.cpp b/3rdparty/lolly/System/Classes/url.cpp
index a7ff069291e5f846a0db2e4b7c6d749878952d12..321529adb6779d7d411b5c89c7b313f9961fec27 100644
--- a/3rdparty/lolly/System/Classes/url.cpp
+++ b/3rdparty/lolly/System/Classes/url.cpp
@@ -461,6 +461,7 @@ glue (url u, string s) {
   if (is_concat (u)) return u[1] * glue (u[2], s);
   if (is_or (u)) return glue (u[1], s) | glue (u[2], s);
   if (is_none (u)) return u;
+  if (is_root (u)) return as_url (url_tree (u[1]->t->label * s));
   TM_FAILED ("can't glue string to url");
   return u;
 }
diff --git a/devel/211_2.md b/devel/211_2.md
new file mode 100644
index 0000000000000000000000000000000000000000..eb5bcb1565dbfc59808b9acf3fb478dcffadd637
--- /dev/null
+++ b/devel/211_2.md
@@ -0,0 +1,32 @@
+# 211_2
+## 如何测试
+### 测试在 lolly 的 glue 函数中添加对根目录的处理
+1. cmd-o 打开文件
+2. 选择根目录（Mactonish HD）
+3. 打开
+4. 检查：STEM 没有 Crash，弹窗显示"The file cannot be created or loaded /"
+
+## 在 lolly 的 glue 函数中添加对根目录的处理
+### Why?
+在此 Issue 中，macOS平台因为打开了根目录而导致crash：macOS上打开根目录导致Crash
+https://gitee.com/XmacsLabs/mogan/issues/ICPW34
+
+崩溃的具体原因是，在调用 lolly 的 glue 函数时，lolly 的条件并没有覆盖到根目录的情况，导致报出 TM_FAILED
+
+```
+url
+glue (url u, string s) {
+  if (is_atomic (u)) return as_url (url_tree (u->t->label * s));
+  if (is_concat (u)) return u[1] * glue (u[2], s);
+  if (is_or (u)) return glue (u[1], s) | glue (u[2], s);
+  if (is_none (u)) return u;
+  TM_FAILED ("can't glue string to url");
+  return u;
+}
+```
+
+### How?
+添加特殊处理根目录的分支
+```
+  if (is_root (u)) return as_url (url_tree (u[1]->t->label * s));
+```