diff --git a/src/Module/ProjectManagement/Infrastructure/EventListener/ProjectDefaultWorkflowListener.php b/src/Module/ProjectManagement/Infrastructure/EventListener/ProjectDefaultWorkflowListener.php
index 39404b9..f4c26fd 100644
--- a/src/Module/ProjectManagement/Infrastructure/EventListener/ProjectDefaultWorkflowListener.php
+++ b/src/Module/ProjectManagement/Infrastructure/EventListener/ProjectDefaultWorkflowListener.php
@@ -7,6 +7,7 @@ namespace App\Module\ProjectManagement\Infrastructure\EventListener;
 use App\Module\ProjectManagement\Domain\Entity\Project;
 use App\Module\ProjectManagement\Domain\Repository\WorkflowRepositoryInterface;
 use Doctrine\ORM\Event\PrePersistEventArgs;
+use RuntimeException;
 
 /**
  * Assigns the default workflow to a project when none was provided.
@@ -26,8 +27,10 @@ final readonly class ProjectDefaultWorkflowListener
         $default = $this->workflowRepository->findDefault()
             ?? ($this->workflowRepository->findBy([], ['position' => 'ASC'], 1)[0] ?? null);
 
-        if (null !== $default) {
-            $project->setWorkflow($default);
+        if (null === $default) {
+            throw new RuntimeException('Cannot create a project: no workflow exists. Seed at least one workflow first.');
         }
+
+        $project->setWorkflow($default);
     }
 }