diff --git a/lib/Middleware/InjectionMiddleware.php b/lib/Middleware/InjectionMiddleware.php
index 70f7081d2..dfd70fb55 100644
--- a/lib/Middleware/InjectionMiddleware.php
+++ b/lib/Middleware/InjectionMiddleware.php
@@ -195,6 +195,7 @@ public function afterException($controller, $methodName, \Exception $exception):
 			);
 
 			$policy = new ContentSecurityPolicy();
+			$policy->allowEvalScript(true);
 			$policy->addAllowedFrameDomain('\'self\'');
 			$response->setContentSecurityPolicy($policy);
 			return $response;