diff --git a/Source/Modules/LangModelRelated/SubLMs/lmCoreNS.swift b/Source/Modules/LangModelRelated/SubLMs/lmCoreNS.swift
index 631cc710..ac0ab9db 100644
--- a/Source/Modules/LangModelRelated/SubLMs/lmCoreNS.swift
+++ b/Source/Modules/LangModelRelated/SubLMs/lmCoreNS.swift
@@ -82,7 +82,8 @@ extension vChewing {
 
       do {
         let rawData = try Data(contentsOf: URL(fileURLWithPath: path))
-        let rawPlist = try PropertyListSerialization.propertyList(from: rawData, format: nil) as! [String: [Data]]
+        let rawPlist: [String: [Data]] =
+          try PropertyListSerialization.propertyList(from: rawData, format: nil) as? [String: [Data]] ?? .init()
         rangeMap = rawPlist
       } catch {
         IME.prtDebugIntel("↑ Exception happened when reading plist file at: \(path).")