diff --git a/rules-tests/Php74/Rector/If_/IfToNullCoalescingAssignRector/Fixture/isset_nullable_property.php.inc b/rules-tests/Php74/Rector/If_/IfToNullCoalescingAssignRector/Fixture/isset_nullable_property.php.inc
new file mode 100644
index 00000000000..febca5dccb7
--- /dev/null
+++ b/rules-tests/Php74/Rector/If_/IfToNullCoalescingAssignRector/Fixture/isset_nullable_property.php.inc
@@ -0,0 +1,37 @@
+<?php
+
+namespace Rector\Tests\Php74\Rector\If_\IfToNullCoalescingAssignRector\Fixture;
+
+class IssetNullableProperty
+{
+    private ?array $values = null;
+
+    public function get(): array
+    {
+        if (! isset($this->values)) {
+            $this->values = ['default'];
+        }
+
+        return $this->values;
+    }
+}
+
+?>
+-----
+<?php
+
+namespace Rector\Tests\Php74\Rector\If_\IfToNullCoalescingAssignRector\Fixture;
+
+class IssetNullableProperty
+{
+    private ?array $values = null;
+
+    public function get(): array
+    {
+        $this->values ??= ['default'];
+
+        return $this->values;
+    }
+}
+
+?>
diff --git a/rules/Php74/Rector/If_/IfToNullCoalescingAssignRector.php b/rules/Php74/Rector/If_/IfToNullCoalescingAssignRector.php
index 859a9f05117..1b51b6d0679 100644
--- a/rules/Php74/Rector/If_/IfToNullCoalescingAssignRector.php
+++ b/rules/Php74/Rector/If_/IfToNullCoalescingAssignRector.php
@@ -17,11 +17,13 @@
 use PhpParser\Node\Stmt\Else_;
 use PhpParser\Node\Stmt\Expression;
 use PhpParser\Node\Stmt\If_;
+use PHPStan\Reflection\Php\PhpPropertyReflection;
 use PHPStan\Type\MixedType;
 use PHPStan\Type\TypeCombinator;
 use Rector\PhpParser\Node\BetterNodeFinder;
 use Rector\PhpParser\Node\Value\ValueResolver;
 use Rector\Rector\AbstractRector;
+use Rector\Reflection\ReflectionResolver;
 use Rector\ValueObject\PhpVersionFeature;
 use Rector\VersionBonding\Contract\MinPhpVersionInterface;
 use Symplify\RuleDocGenerator\ValueObject\CodeSample\CodeSample;
@@ -34,7 +36,8 @@ final class IfToNullCoalescingAssignRector extends AbstractRector implements Min
 {
     public function __construct(
         private readonly BetterNodeFinder $betterNodeFinder,
-        private readonly ValueResolver $valueResolver
+        private readonly ValueResolver $valueResolver,
+        private readonly ReflectionResolver $reflectionResolver
     ) {
     }
 
@@ -127,7 +130,12 @@ private function isNonNullableProperty(Expr $expr): bool
             return false;
         }
 
-        $propertyType = $this->nodeTypeResolver->getType($expr);
+        $phpPropertyReflection = $this->reflectionResolver->resolvePropertyReflectionFromPropertyFetch($expr);
+        if (! $phpPropertyReflection instanceof PhpPropertyReflection) {
+            return false;
+        }
+
+        $propertyType = $phpPropertyReflection->getReadableType();
         if ($propertyType instanceof MixedType) {
             return false;
         }