diff --git a/AssFontSubset/MainWindow.xaml.cs b/AssFontSubset/MainWindow.xaml.cs
index 3721a17..5f0a984 100644
--- a/AssFontSubset/MainWindow.xaml.cs
+++ b/AssFontSubset/MainWindow.xaml.cs
@@ -390,14 +390,17 @@ private void ChangeXmlFontName(List<SubsetFontInfo> subsetFonts)
 
                     // find cid for ellipsis (\u2026)
                     XmlNode cmap = xd.SelectSingleNode(@"//map[@code='0x2026']");
-                    String ellipsisCid = cmap.Attributes["name"].Value.Trim();
-                    XmlNodeList substitutionNodes = xd.SelectNodes($"//Substitution[@in='{ellipsisCid}']");
-                    
-                    // remove substitution for lower ellipsis. 
-                    // NOTE: Vertical ellipsis is cid5xxxxx, and we need to keep it. Hopefully Adobe won't change it.
-                    foreach (XmlNode sNode in substitutionNodes) {
-                        if (Regex.IsMatch(sNode.Attributes["out"].Value, @"cid6")){
-                            sNode.ParentNode.RemoveChild(sNode);
+                    if (cmap != null) {
+                        String ellipsisCid = cmap.Attributes["name"].Value.Trim();
+                        XmlNodeList substitutionNodes = xd.SelectNodes($"//Substitution[@in='{ellipsisCid}']");
+                        // remove substitution for lower ellipsis. 
+                        // NOTE: Vertical ellipsis is cid5xxxxx, and we need to keep it. Hopefully Adobe won't change it.
+                        foreach (XmlNode sNode in substitutionNodes)
+                        {
+                            if (Regex.IsMatch(sNode.Attributes["out"].Value, @"cid6"))
+                            {
+                                sNode.ParentNode.RemoveChild(sNode);
+                            }
                         }
                     }
                 }
diff --git a/AssFontSubset/Properties/AssemblyInfo.cs b/AssFontSubset/Properties/AssemblyInfo.cs
index e02078a..13491fe 100644
--- a/AssFontSubset/Properties/AssemblyInfo.cs
+++ b/AssFontSubset/Properties/AssemblyInfo.cs
@@ -51,5 +51,5 @@
 // 可以指定所有值，也可以使用以下所示的 "*" 预置版本号和修订号
 // 方法是按如下所示使用“*”: :
 // [assembly: AssemblyVersion("1.0.*")]
-[assembly: AssemblyVersion("1.1.24.2")]
-[assembly: AssemblyFileVersion("1.1.24.2")]
+[assembly: AssemblyVersion("1.1.24.3")]
+[assembly: AssemblyFileVersion("1.1.24.3")]