diff --git a/src/Type/Mage/GetResourceModel.php b/src/Type/Mage/GetResourceModel.php
index c6eaffa..5c24a0f 100644
--- a/src/Type/Mage/GetResourceModel.php
+++ b/src/Type/Mage/GetResourceModel.php
@@ -7,11 +7,15 @@ final class GetResourceModel extends StaticMethodReturnTypeDetector
 {
     public function getMagentoClassName(string $identifier): string
     {
-        return $this->getMagentoConfig()->getResourceModelClassName($identifier);
+        $className = $this->getMagentoConfig()->getResourceModelClassName($identifier);
+        if ($className === false) {
+            throw new \PHPStan\Broker\ClassNotFoundException($identifier);
+        }
+        return $className;
     }
 
     protected static function getMethodName(): string
     {
         return 'getResourceModel';
     }
-}
\ No newline at end of file
+}