diff --git a/src/EventListener/StateChangeRequestListener.php b/src/EventListener/StateChangeRequestListener.php
index aeb365e..ec5cc56 100644
--- a/src/EventListener/StateChangeRequestListener.php
+++ b/src/EventListener/StateChangeRequestListener.php
@@ -7,6 +7,7 @@
 use Symfony\Component\HttpKernel\Event\RequestEvent;
 use Tienvx\Bundle\PactProviderBundle\Exception\BadMethodCallException;
 use Tienvx\Bundle\PactProviderBundle\Exception\BadRequestException;
+use Tienvx\Bundle\PactProviderBundle\Exception\NoHandlerForStateException;
 
 class StateChangeRequestListener
 {
@@ -35,6 +36,9 @@ public function __invoke(RequestEvent $event): void
             if (!in_array($action, [self::SETUP_ACTION, self::TEARDOWN_ACTION])) {
                 throw new BadRequestException(sprintf("Action '%s' is not supported in state change request.", $action));
             }
+            if (!$this->locator->has($state)) {
+                throw new NoHandlerForStateException(sprintf("No handler for state '%s'.", $state));
+            }
             $handler = $this->locator->get($state);
             $method = [$handler, self::METHODS[$action]];
             if (!is_callable($method)) {
diff --git a/src/Exception/NoHandlerForStateException.php b/src/Exception/NoHandlerForStateException.php
new file mode 100644
index 0000000..8e709c3
--- /dev/null
+++ b/src/Exception/NoHandlerForStateException.php
@@ -0,0 +1,7 @@
+<?php
+
+namespace Tienvx\Bundle\PactProviderBundle\Exception;
+
+class NoHandlerForStateException extends \LogicException
+{
+}