diff --git a/package.json b/package.json
index 08d4b69..f26b5f0 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "desktop-translator",
   "private": true,
-  "version": "0.5.0",
+  "version": "0.5.1",
   "type": "module",
   "scripts": {
     "dev": "vite",
diff --git a/src-tauri/Cargo.lock b/src-tauri/Cargo.lock
index 4dcb94e..9d50d4d 100644
--- a/src-tauri/Cargo.lock
+++ b/src-tauri/Cargo.lock
@@ -880,7 +880,7 @@ dependencies = [
 
 [[package]]
 name = "desktop-translator"
-version = "0.5.0"
+version = "0.5.1"
 dependencies = [
  "apple-native-keyring-store",
  "async-trait",
diff --git a/src-tauri/Cargo.toml b/src-tauri/Cargo.toml
index fc7baad..dd3adcd 100644
--- a/src-tauri/Cargo.toml
+++ b/src-tauri/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "desktop-translator"
-version = "0.5.0"
+version = "0.5.1"
 description = "Lightweight cross-platform selection translator"
 authors = ["Desktop Translator Contributors"]
 edition = "2021"
diff --git a/src-tauri/src/platform/macos/selection.rs b/src-tauri/src/platform/macos/selection.rs
index b9ad626..6a71fb5 100644
--- a/src-tauri/src/platform/macos/selection.rs
+++ b/src-tauri/src/platform/macos/selection.rs
@@ -530,7 +530,10 @@ fn sentence_containing_selection(
                 .match_indices(selected_text)
                 .map(|(start, value)| (start, start + value.len()))
                 .collect::<Vec<_>>();
-            (matches.len() == 1).then_some(matches[0])
+            match matches.as_slice() {
+                [only] => Some(*only),
+                _ => None,
+            }
         })?;
 
     let sentence_start = full_text[..selection_start]
@@ -1442,6 +1445,18 @@ mod tests {
         );
     }
 
+    #[test]
+    fn sentence_extraction_rejects_a_selection_missing_from_the_accessible_value() {
+        assert_eq!(
+            sentence_containing_selection(
+                "Chrome can expose a partial accessible value.",
+                "translator",
+                None,
+            ),
+            None
+        );
+    }
+
     #[test]
     fn successful_accessibility_wake_is_attempted_once_per_process() {
         let cache = AccessibilityWakeCache::default();
diff --git a/src-tauri/tauri.conf.json b/src-tauri/tauri.conf.json
index ca3db4b..c418ae0 100644
--- a/src-tauri/tauri.conf.json
+++ b/src-tauri/tauri.conf.json
@@ -1,7 +1,7 @@
 {
   "$schema": "https://schema.tauri.app/config/2",
   "productName": "Desktop Translator",
-  "version": "0.5.0",
+  "version": "0.5.1",
   "identifier": "com.desktoptranslator.desktop",
   "build": {
     "beforeDevCommand": "pnpm dev",