diff --git a/src/Type/Accessory/OversizedArrayType.php b/src/Type/Accessory/OversizedArrayType.php
index 77fdec48fb..f608d9602d 100644
--- a/src/Type/Accessory/OversizedArrayType.php
+++ b/src/Type/Accessory/OversizedArrayType.php
@@ -21,7 +21,6 @@
 use PHPStan\Type\Traits\NonGenericTypeTrait;
 use PHPStan\Type\Traits\NonObjectTypeTrait;
 use PHPStan\Type\Traits\NonRemoveableTypeTrait;
-use PHPStan\Type\Traits\TruthyBooleanTypeTrait;
 use PHPStan\Type\Traits\UndecidedComparisonCompoundTypeTrait;
 use PHPStan\Type\Type;
 use PHPStan\Type\UnionType;
@@ -32,7 +31,6 @@ class OversizedArrayType implements CompoundType, AccessoryType
 
 	use MaybeCallableTypeTrait;
 	use NonObjectTypeTrait;
-	use TruthyBooleanTypeTrait;
 	use NonGenericTypeTrait;
 	use UndecidedComparisonCompoundTypeTrait;
 	use NonRemoveableTypeTrait;
@@ -414,6 +412,11 @@ public function toAbsoluteNumber(): Type
 		return new ErrorType();
 	}
 
+	public function toBoolean(): BooleanType
+	{
+		return new BooleanType();
+	}
+
 	public function toInteger(): Type
 	{
 		return new ConstantIntegerType(1);
diff --git a/tests/PHPStan/Rules/Comparison/BooleanNotConstantConditionRuleTest.php b/tests/PHPStan/Rules/Comparison/BooleanNotConstantConditionRuleTest.php
index 24df1d9ea1..2b1833c369 100644
--- a/tests/PHPStan/Rules/Comparison/BooleanNotConstantConditionRuleTest.php
+++ b/tests/PHPStan/Rules/Comparison/BooleanNotConstantConditionRuleTest.php
@@ -145,6 +145,12 @@ public function testBug8797(): void
 		$this->analyse([__DIR__ . '/data/bug-8797.php'], []);
 	}
 
+	public function testBug13797(): void
+	{
+		$this->treatPhpDocTypesAsCertain = true;
+		$this->analyse([__DIR__ . '/data/bug-13797.php'], []);
+	}
+
 	public function testBug7937(): void
 	{
 		$this->treatPhpDocTypesAsCertain = true;
diff --git a/tests/PHPStan/Rules/Comparison/data/bug-13797.php b/tests/PHPStan/Rules/Comparison/data/bug-13797.php
new file mode 100644
index 0000000000..8a17ac3b2f
--- /dev/null
+++ b/tests/PHPStan/Rules/Comparison/data/bug-13797.php
@@ -0,0 +1,82 @@
+<?php declare(strict_types = 1);
+
+namespace Bug13797;
+
+/** @return ?array<string, mixed> */
+function alert(): ?array
+{
+	$alerts = [];
+
+	if (rand()) {
+		$alerts[] = [
+			'message'  => "Foo",
+			'details'  => "bar",
+			'duration' => rand() ?: null,
+			'severity' => 100,
+		];
+	}
+
+	if (rand()) {
+		$alerts[] = [
+			'message'  => 'Offline',
+			'duration' => rand() ?: null,
+			'severity' => 99,
+		];
+	}
+
+	if (rand()) {
+		$alerts[] = [
+			'message'  => 'Running W/O Operator',
+			'duration' => rand() ?: null,
+			'severity' => 75,
+		];
+	}
+
+	if (rand()) {
+		$alerts[] = [
+			'message'  => 'No Queue',
+			'duration' => rand() ?: null,
+			'severity' => 60,
+		];
+	}
+
+	if (rand()) {
+		if (rand()) {
+			$alerts[] = [
+				'message'  => 'Not Scheduled',
+				'duration' => null,
+				'severity' => 25,
+			];
+		}
+
+		if (rand()) {
+			$alerts[] = [
+				'message'  => 'On Lunch',
+				'duration' => rand() ?: null,
+				'severity' => 24,
+			];
+		}
+
+		if (rand()) {
+			$alerts[] = [
+				'message'  => 'On Break',
+				'duration' => rand() ?: null,
+				'severity' => 24,
+			];
+		}
+	}
+
+	if (rand()) {
+		$alerts[] = [
+			'message'  => 'Idle',
+			'duration' => rand() ?: null,
+			'severity' => 23,
+		];
+	}
+
+	if (!$alerts) {
+		return null;
+	}
+
+	return $alerts[0];
+}