diff --git a/src/DocBlock/StandardTagFactory.php b/src/DocBlock/StandardTagFactory.php
index d029cd1b..e580ef6a 100644
--- a/src/DocBlock/StandardTagFactory.php
+++ b/src/DocBlock/StandardTagFactory.php
@@ -282,8 +282,8 @@ private function getArgumentsForParametersFromWiring(array $parameters, array $l
             }
 
             $parameterName = $parameter->getName();
-            if (isset($locator[$typeHint])) {
-                $arguments[$parameterName] = $locator[$typeHint];
+            if (isset($locator[$typeHint ?? ''])) {
+                $arguments[$parameterName] = $locator[$typeHint ?? ''];
                 continue;
             }
 
diff --git a/tests/unit/DocBlock/StandardTagFactoryTest.php b/tests/unit/DocBlock/StandardTagFactoryTest.php
index 8dfced71..a75f5e64 100644
--- a/tests/unit/DocBlock/StandardTagFactoryTest.php
+++ b/tests/unit/DocBlock/StandardTagFactoryTest.php
@@ -525,6 +525,11 @@ public function validTagProvider(): array
                 'tag',
                 '@tag (is valid)',
             ],
+            'full-qualified-class-name following a tag name is valid' => [
+                '@tag \InvalidArgumentException',
+                'tag',
+                '@tag \InvalidArgumentException',
+            ],
         ];
     }