diff --git a/tasks/phpstan/phpstan-baseline-integration-tests.neon b/tasks/phpstan/phpstan-baseline-integration-tests.neon
index 9bd07c7d28..3c4c99cb75 100644
--- a/tasks/phpstan/phpstan-baseline-integration-tests.neon
+++ b/tasks/phpstan/phpstan-baseline-integration-tests.neon
@@ -790,4 +790,7 @@ parameters:
 			count: 1
 			path: ../../tests/integration/_bootstrap.php
 
-
+		-
+			message: "#^Parameter \\#1 \\$newsletter of method MailPoet\\\\Entities\\\\NewsletterTemplateEntity\\:\\:setNewsletter\\(\\) expects MailPoet\\\\Entities\\\\NewsletterEntity\\|null, object given\\.$#"
+			count: 1
+			path: ../../tests/integration/API/JSON/v1/NewsletterTemplatesTest.php
diff --git a/tasks/phpstan/phpstan-baseline.neon b/tasks/phpstan/phpstan-baseline.neon
index bd2be6aa47..40126acbcb 100644
--- a/tasks/phpstan/phpstan-baseline.neon
+++ b/tasks/phpstan/phpstan-baseline.neon
@@ -238,3 +238,8 @@ parameters:
 			message: "#^Unreachable statement \\- code above always terminates\\.$#"
 			count: 1
 			path: ../../lib/Util/DOM.php
+
+		-
+			message: "#^Parameter \\#1 \\$newsletter of method MailPoet\\\\Entities\\\\NewsletterTemplateEntity\\:\\:setNewsletter\\(\\) expects MailPoet\\\\Entities\\\\NewsletterEntity\\|null, object given\\.$#"
+			count: 1
+			path: ../../lib/NewsletterTemplates/NewsletterTemplatesRepository.php