diff --git a/src/Rules/Classes/ExistingClassInInstanceOfRule.php b/src/Rules/Classes/ExistingClassInInstanceOfRule.php
index c04a3d4b11..293dd6285d 100644
--- a/src/Rules/Classes/ExistingClassInInstanceOfRule.php
+++ b/src/Rules/Classes/ExistingClassInInstanceOfRule.php
@@ -77,9 +77,10 @@ public function processNode(Node $node, Scope $scope): array
 		}
 
 		$classReflection = $this->reflectionProvider->getClass($name);
-		$expressionType = $scope->getType($node->expr);
 
 		if ($classReflection->isTrait()) {
+			$expressionType = $scope->getType($node->expr);
+
 			$errors[] = RuleErrorBuilder::message(sprintf(
 				'Instanceof between %s and trait %s will always evaluate to false.',
 				$expressionType->describe(VerbosityLevel::typeOnly()),