diff --git a/.project/tests/phpstan-baseline.neon b/.project/tests/phpstan-baseline.neon
index 882eeb57c..5891dba20 100644
--- a/.project/tests/phpstan-baseline.neon
+++ b/.project/tests/phpstan-baseline.neon
@@ -2510,11 +2510,6 @@ parameters:
 			count: 1
 			path: ../../Classes/Domain/Validator/SpamShield/ValueBlacklistMethod.php
 
-		-
-			message: "#^Cannot call method getValue\\(\\) on object\\|null\\.$#"
-			count: 2
-			path: ../../Classes/Domain/Validator/SpamShield/ValueBlacklistMethod.php
-
 		-
 			message: "#^Method In2code\\\\Powermail\\\\Domain\\\\Validator\\\\SpamShield\\\\ValueBlacklistMethod\\:\\:getValues\\(\\) return type has no value type specified in iterable type array\\.$#"
 			count: 1
diff --git a/Classes/Domain/Validator/SpamShield/ValueBlacklistMethod.php b/Classes/Domain/Validator/SpamShield/ValueBlacklistMethod.php
index fa238e82f..3c6284727 100644
--- a/Classes/Domain/Validator/SpamShield/ValueBlacklistMethod.php
+++ b/Classes/Domain/Validator/SpamShield/ValueBlacklistMethod.php
@@ -3,6 +3,7 @@
 declare(strict_types=1);
 namespace In2code\Powermail\Domain\Validator\SpamShield;
 
+use In2code\Powermail\Domain\Model\Answer;
 use In2code\Powermail\Utility\ObjectUtility;
 use TYPO3\CMS\Core\Utility\GeneralUtility;
 
@@ -23,12 +24,16 @@ class ValueBlacklistMethod extends AbstractMethod
      */
     public function spamCheck(): bool
     {
+        /** @var Answer $answer */
         foreach ($this->mail->getAnswers() as $answer) {
             if (is_array($answer->getValue())) {
                 continue;
             }
+            if (is_bool($answer->getValue())) {
+                continue;
+            }
             foreach ($this->getValues() as $blackword) {
-                if ($this->isStringInString($answer->getValue(), $blackword)) {
+                if ($this->isStringInString((string)$answer->getValue(), $blackword)) {
                     return true;
                 }
             }