diff --git a/src/Phaseolies/Helpers/helpers.php b/src/Phaseolies/Helpers/helpers.php
index 8b081e18..0617c08f 100644
--- a/src/Phaseolies/Helpers/helpers.php
+++ b/src/Phaseolies/Helpers/helpers.php
@@ -2,7 +2,7 @@
 
 use Phaseolies\Utilities\Paginator;
 use Phaseolies\Translation\Translator;
-use Phaseolies\Support\UrlGenerator;
+use Phaseolies\Support\Contracts\UrlGeneratorInterface;
 use Phaseolies\Support\StringService;
 use Phaseolies\Support\Facades\Log;
 use Phaseolies\Support\Facades\Crypt;
@@ -194,11 +194,11 @@ function lang(): Translator
      * @param string|null $path
      * @param mixed $parameters
      * @param bool|null $secure
-     * @return ($path is null ? \Phaseolies\Support\UrlGenerator : string)
+     * @return ($path is null ? \Phaseolies\Support\Contracts\UrlGeneratorInterface : string)
      */
     function url(?string $path = null, $parameters = [], ?bool $secure = null)
     {
-        $urlGenerator = app(UrlGenerator::class);
+        $urlGenerator = app(UrlGeneratorInterface::class);
 
         if (is_null($path)) {
             return $urlGenerator;
diff --git a/src/Phaseolies/Support/Contracts/UrlGeneratorInterface.php b/src/Phaseolies/Support/Contracts/UrlGeneratorInterface.php
index e499af3a..30c0198f 100644
--- a/src/Phaseolies/Support/Contracts/UrlGeneratorInterface.php
+++ b/src/Phaseolies/Support/Contracts/UrlGeneratorInterface.php
@@ -14,7 +14,7 @@ interface UrlGeneratorInterface
     public function enqueue(string $path = '/', ?bool $secure = null): string;
 
     /**
-     * Generate the current full URL without query parameters.
+     * Generate the current full URL, including query parameters.
      *
      * @return string
      */
@@ -92,10 +92,10 @@ public function signed(string $path = '/', array|string|int $parameters = [], in
     /**
      * Determine whether a value is a valid URL.
      *
-     * @param string $path
+     * @param mixed $path
      * @return bool
      */
-    public function isValid(string $path): bool;
+    public function isValid(mixed $path): bool;
 
     /**
      * Get the configured base URL.
diff --git a/src/Phaseolies/Support/Facades/URL.php b/src/Phaseolies/Support/Facades/URL.php
index 99635aaa..e43e417e 100644
--- a/src/Phaseolies/Support/Facades/URL.php
+++ b/src/Phaseolies/Support/Facades/URL.php
@@ -5,21 +5,21 @@
 use Phaseolies\Facade\BaseFacade;
 
 /**
- * @method static string enqueue(string $path = '/', $secure = null)
+ * @method static string enqueue(string $path = '/', ?bool $secure = null)
  * @method static string full()
  * @method static string current()
  * @method static string route(string $name, array|string|int $parameters = [], ?bool $secure = null)
- * @method static \Phaseolies\Support\UrlGenerator to($path = '/')
- * @method static \Phaseolies\Support\UrlGenerator withQuery(array|string $query = [])
- * @method static \Phaseolies\Support\UrlGenerator withSignature($expiration = 3600)
- * @method static \Phaseolies\Support\UrlGenerator withFragment($fragment = '')
+ * @method static \Phaseolies\Support\Contracts\UrlGeneratorInterface to(string $path = '/', array|string|int $parameters = [], ?bool $secure = null)
+ * @method static \Phaseolies\Support\Contracts\UrlGeneratorInterface withQuery(array|string $query = [])
+ * @method static \Phaseolies\Support\Contracts\UrlGeneratorInterface withSignature(int $expiration = 3600)
+ * @method static \Phaseolies\Support\Contracts\UrlGeneratorInterface withFragment(string $fragment = '')
  * @method static string make()
  * @method static string signed(string $path = '/', array|string|int $parameters = [], int $expiration = 3600, ?bool $secure = null)
- * @method static bool isValid(string $url)
+ * @method static bool isValid(mixed $url)
  * @method static string base()
- * @method static \Phaseolies\Support\UrlGenerator setSecure(bool $secure)
+ * @method static \Phaseolies\Support\Contracts\UrlGeneratorInterface setSecure(bool $secure)
  *
- * @see \Phaseolies\Support\UrlGenerator
+ * @see \Phaseolies\Support\Contracts\UrlGeneratorInterface
  */
 class URL extends BaseFacade
 {
diff --git a/src/Phaseolies/Support/UrlGenerator.php b/src/Phaseolies/Support/UrlGenerator.php
index 729da171..92289c82 100644
--- a/src/Phaseolies/Support/UrlGenerator.php
+++ b/src/Phaseolies/Support/UrlGenerator.php
@@ -104,7 +104,7 @@ public function enqueue(string $path = '/', ?bool $secure = null): string
     }
 
     /**
-     * Generate a full URL without query parameters.
+     * Generate the current full URL, including query parameters.
      *
      * @return string
      */
@@ -242,9 +242,24 @@ public function make(): string
             $url .= '#' . $this->fragment;
         }
 
+        $this->resetBuilderState();
+
         return $url;
     }
 
+    /**
+     * Reset the per-URL builder state
+     *
+     * @return void
+     */
+    protected function resetBuilderState(): void
+    {
+        $this->path = '/';
+        $this->query = [];
+        $this->fragment = '';
+        $this->expiration = 0;
+    }
+
     /**
      * Generate a signed URL.
      *
@@ -282,11 +297,15 @@ protected function createSignature(array $parameters): string
      * This method is taken from PHP Laravel framework
      * Determine if the given path is a valid URL.
      *
-     * @param string $path
+     * @param mixed $path
      * @return bool
      */
-    public function isValid(string $path): bool
+    public function isValid(mixed $path): bool
     {
+        if (! is_string($path)) {
+            return false;
+        }
+
         if (! preg_match('~^(#|//|https?://|(mailto|tel|sms):)~', $path)) {
             return filter_var($path, FILTER_VALIDATE_URL) !== false;
         }
diff --git a/tests/UrlGeneratorTest.php b/tests/UrlGeneratorTest.php
index 4f48f5a3..ee2c4cf5 100644
--- a/tests/UrlGeneratorTest.php
+++ b/tests/UrlGeneratorTest.php
@@ -62,6 +62,37 @@ public function testApplicationBindsTheUrlContractAndLegacyServiceNameToTheSameS
         }
     }
 
+    public function testIsValidReturnsFalseForNonStringValues(): void
+    {
+        $this->assertFalse($this->urlGenerator->isValid(null));
+        $this->assertFalse($this->urlGenerator->isValid(123));
+        $this->assertFalse($this->urlGenerator->isValid(['https://example.com']));
+    }
+
+    public function testBuilderStateDoesNotLeakBetweenUrls(): void
+    {
+        $this->urlGenerator->to('first')->withQuery(['id' => 1])->withFragment('top')->make();
+
+        $this->assertEquals('http://localhost/second', $this->urlGenerator->to('second')->make());
+    }
+
+    public function testUrlHelperResolvesTheSharedSingleton(): void
+    {
+        $app = $this->getMockBuilder(Application::class)->disableOriginalConstructor()->onlyMethods([])->getMock();
+        (new ReflectionClass(Container::class))->getConstructor()->invoke($app);
+        $previous = Container::getInstance();
+        Container::setInstance($app);
+
+        try {
+            putenv('APP_URL=http://localhost');
+            (new FacadeLauncher($app))->register();
+
+            $this->assertSame($app->get('url'), url());
+        } finally {
+            Container::setInstance($previous);
+        }
+    }
+
     protected function tearDown(): void
     {
         unset($_SERVER['HTTP_HOST']);