diff --git a/CHANGELOG.md b/CHANGELOG.md
index bee5391..84024b1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 ## [Unreleased]
 
+- Fix TypeError when exceptions with string error codes are thrown
 
 ## [0.7.3] - 2021-06-29
 
diff --git a/example/generated/Twitch/Twirp/Example/TwirpError.php b/example/generated/Twitch/Twirp/Example/TwirpError.php
index aaff79c..32fdaf0 100644
--- a/example/generated/Twitch/Twirp/Example/TwirpError.php
+++ b/example/generated/Twitch/Twirp/Example/TwirpError.php
@@ -91,8 +91,9 @@ public static function newError(string $code, string $msg): self
     public static function errorFrom(\Throwable $e, string $msg = ''): self
     {
         $msg = empty($msg) ? $e->getMessage() : $msg;
+        $code = is_int($e->getCode()) ? $e->getCode() : 0;
 
-        $err = new self(ErrorCode::Internal, $msg, $e->getCode(), $e);
+        $err = new self(ErrorCode::Internal, $msg, $code, $e);
         $err->setMeta('cause', $e->getMessage());
 
         return $err;
diff --git a/example/tests/TwirpErrorTest.php b/example/tests/TwirpErrorTest.php
index 73aea86..54d3eb9 100644
--- a/example/tests/TwirpErrorTest.php
+++ b/example/tests/TwirpErrorTest.php
@@ -102,4 +102,30 @@ public function it_creates_an_error_from_an_exception_with_a_custom_message(): v
         $this->assertEquals('custom msg', $error->getMessage());
         $this->assertEquals('msg', $error->getMeta('cause'));
     }
+
+    /**
+     * Exception->getCode is not guaranteed to return an int, even though the method has a type hint.
+     * See: https://www.php.net/manual/en/exception.getcode.php
+     * > Returns the exception code as int in Exception but possibly as other
+     * > type in Exception descendants (for example as string in PDOException).
+     *
+     * @test
+     */
+    public function it_works_with_string_codes(): void
+    {
+        $exception = new class('msg', 'code') extends \PDOException
+        {
+            public function __construct(string $msg, string $code)
+            {
+                parent::__construct($msg);
+                $this->code = $code;
+            }
+        };
+        $error = TwirpError::errorFrom($exception);
+
+        $this->assertEquals(ErrorCode::Internal, $error->getErrorCode());
+        $this->assertEquals('msg', $error->getMessage());
+        $this->assertEquals('msg', $error->getMeta('cause'));
+        $this->assertEquals(0, $error->getCode());
+    }
 }
diff --git a/protoc-gen-twirp_php/templates/global/TwirpError.php.tmpl b/protoc-gen-twirp_php/templates/global/TwirpError.php.tmpl
index 4cff887..b525239 100644
--- a/protoc-gen-twirp_php/templates/global/TwirpError.php.tmpl
+++ b/protoc-gen-twirp_php/templates/global/TwirpError.php.tmpl
@@ -91,8 +91,10 @@ final class TwirpError extends \Exception implements Error
     public static function errorFrom(\Throwable $e, string $msg = ''): self
     {
         $msg = empty($msg) ? $e->getMessage() : $msg;
+        // Exception->getCode is not guaranteed to return an int, see https://www.php.net/manual/en/exception.getcode.php
+        $code = is_int($e->getCode()) ? $e->getCode() : 0;
 
-        $err = new self(ErrorCode::Internal, $msg, $e->getCode(), $e);
+        $err = new self(ErrorCode::Internal, $msg, $code, $e);
         $err->setMeta('cause', $e->getMessage());
 
         return $err;