diff --git a/Packages/ComposeUI/Sources/ComposeUI/Views/LanguagePicker.swift b/Packages/ComposeUI/Sources/ComposeUI/Views/LanguagePicker.swift
index 22eb211b..4680d5e9 100644
--- a/Packages/ComposeUI/Sources/ComposeUI/Views/LanguagePicker.swift
+++ b/Packages/ComposeUI/Sources/ComposeUI/Views/LanguagePicker.swift
@@ -22,10 +22,11 @@ struct LanguagePicker: View {
     }
     
     static func codeFromInputMode(_ mode: UITextInputMode) -> Locale.LanguageCode? {
-        guard let bcp47Lang = mode.primaryLanguage else {
+        guard let bcp47Lang = mode.primaryLanguage,
+              !bcp47Lang.isEmpty else {
             return nil
         }
-        var maybeIso639Code = bcp47Lang[..<bcp47Lang.index(bcp47Lang.startIndex, offsetBy: 3)]
+        var maybeIso639Code = bcp47Lang[..<bcp47Lang.index(bcp47Lang.startIndex, offsetBy: min(3, bcp47Lang.count))]
         if maybeIso639Code.last == "-" {
             maybeIso639Code = maybeIso639Code[..<maybeIso639Code.index(before: maybeIso639Code.endIndex)]
         }