diff --git a/src/Rules/Traits/ConflictingTraitConstantsRule.php b/src/Rules/Traits/ConflictingTraitConstantsRule.php
index 63b1d047a2..ff1802eede 100644
--- a/src/Rules/Traits/ConflictingTraitConstantsRule.php
+++ b/src/Rules/Traits/ConflictingTraitConstantsRule.php
@@ -43,6 +43,12 @@ public function processNode(Node $node, Scope $scope): array
 			return [];
 		}
 
+		// Even though isInClass() is true, we still need to check isInTrait() because
+		// both can be true simultaneously when analyzing trait code.
+		if ($scope->isInTrait()) {
+			return [];
+		}
+
 		$classReflection = $scope->getClassReflection();
 		$traitConstants = [];
 		foreach ($classReflection->getTraits(true) as $trait) {
diff --git a/tests/PHPStan/Rules/Traits/data/conflicting-trait-constants.php b/tests/PHPStan/Rules/Traits/data/conflicting-trait-constants.php
index dc68ba0758..21a13026a3 100644
--- a/tests/PHPStan/Rules/Traits/data/conflicting-trait-constants.php
+++ b/tests/PHPStan/Rules/Traits/data/conflicting-trait-constants.php
@@ -103,3 +103,21 @@ class Bar10
 
 	final public const PUBLIC_FINAL_CONSTANT = 1;
 }
+
+trait Foo1
+{
+	protected const ARR1 = [
+		self::KEY => 'int',
+	];
+}
+
+class Bar11
+{
+	use Foo1;
+
+	protected const KEY = 'k1';
+
+	protected const ARR = self::ARR1 + [
+		'a.b' => 'int',
+	];
+}