diff --git a/data/words-7.php b/data/words-7.php
index 4d752a4e..79878225 100644
--- a/data/words-7.php
+++ b/data/words-7.php
@@ -6284,7 +6284,7 @@
   '琟' => '	wéi	',
   '琠' => '	tiǎn	',
   '琡' => '	chù	',
-  '琢' => '	zuó	',
+  '琢' => '	zhuó	',
   '琣' => '	běng	',
   '琤' => '	chēng	',
   '琥' => '	hǔ	',
diff --git a/sources/pathes/chars.txt b/sources/pathes/chars.txt
index bda0758f..04dceebd 100644
--- a/sources/pathes/chars.txt
+++ b/sources/pathes/chars.txt
@@ -1,2 +1,3 @@
 U+55EF: ǹ  # 嗯
 U+2E81: fǎn # ⺁
+U+7422: zhuó,zuó  # 琢
diff --git a/src/Converter.php b/src/Converter.php
index a892df42..ef90d2ed 100644
--- a/src/Converter.php
+++ b/src/Converter.php
@@ -175,7 +175,7 @@ public function when(bool $condition, callable $callback): static
         return $this;
     }
 
-    public function convert(string $string, ?callable $beforeSplit = null): Collection
+    public function convert(string $string, callable $beforeSplit = null): Collection
     {
         // 把原有的数字和汉字分离，避免拼音转换时被误作声调
         $string = preg_replace_callback('~[a-z0-9_-]+~i', function ($matches) {
diff --git a/tests/PinyinTest.php b/tests/PinyinTest.php
index 3810be4b..20783534 100755
--- a/tests/PinyinTest.php
+++ b/tests/PinyinTest.php
@@ -414,6 +414,9 @@ public function test_issues()
         // https://github.com/overtrue/pinyin/issues/200
         $this->assertPinyin(['pú', 'ōu'], Pinyin::sentence('仆区'));
 
+        // https://github.com/overtrue/pinyin/issues/207
+        $this->assertPinyin(['zhuó'], Pinyin::sentence('琢'));
+
         // https://github.com/overtrue/pinyin/issues/195
         $this->assertSame([
             '你' => ['ni3'],