diff --git a/src/Peachpie.Runtime/Variables.cs b/src/Peachpie.Runtime/Variables.cs
index 7e2c2f1244..5bbb2c1d17 100644
--- a/src/Peachpie.Runtime/Variables.cs
+++ b/src/Peachpie.Runtime/Variables.cs
@@ -601,7 +601,7 @@ public static byte[] ToBytes(this PhpValue value, Context ctx)
         /// Checks the value is of type <c>string</c> or <c>&amp;string</c> and gets its value.
         /// Single-byte strings are decoded using <c>UTF-8</c>.
         /// </summary>
-        public static bool IsPhpArray(this PhpValue value, [MaybeNullWhen(false)]out PhpArray? array) => (array = value.AsArray()) != null;
+        public static bool IsPhpArray(this PhpValue value, [MaybeNullWhen(false)]out PhpArray array) => (array = value.AsArray()) != null;
 
         /// <summary>
         /// Checks the value is of type <c>string</c> or <c>&amp;string</c> and gets its value.
@@ -650,7 +650,7 @@ public static bool IsBinaryString(this PhpValue value, out PhpString @string)
         /// <summary>
         /// Gets value indicating the variable is Unicode string value.
         /// </summary>
-        public static bool IsUnicodeString(this PhpValue value, /*[MaybeNullWhen(false)]*/out string? @string)
+        public static bool IsUnicodeString(this PhpValue value, [MaybeNullWhen(false)]out string @string)
         {
             switch (value.TypeCode)
             {
diff --git a/tests/web/filter_var_array.php b/tests/web/filter_var_array.php
new file mode 100644
index 0000000000..2d2ee4eb90
--- /dev/null
+++ b/tests/web/filter_var_array.php
@@ -0,0 +1,35 @@
+<?php
+namespace web\filter_var_array;
+
+$data = array(
+    'product_id'    => 'libgd<script>',
+    'component'     => '10',
+    'versions'      => '2.0.33',
+    'testscalar'    => array('2', '23', '10', '12'),
+    'testarray'     => '2',
+);
+
+$args = array(
+    'product_id'   => FILTER_SANITIZE_ENCODED,
+    'component'    => array('filter'    => FILTER_VALIDATE_INT,
+                            'flags'     => FILTER_FORCE_ARRAY, 
+                            'options'   => array('min_range' => 1, 'max_range' => 10)
+                           ),
+    'versions'     => FILTER_SANITIZE_ENCODED,
+    'doesnotexist' => FILTER_VALIDATE_INT,
+    'testscalar'   => array(
+                            'filter' => FILTER_VALIDATE_INT,
+                            'flags'  => FILTER_REQUIRE_SCALAR,
+                           ),
+    'testarray'    => array(
+                            'filter' => FILTER_VALIDATE_INT,
+                            'flags'  => FILTER_FORCE_ARRAY,
+                           )
+
+);
+
+$myinputs = filter_var_array($data, $args);
+
+print_r($myinputs);
+
+echo 'Done.';
\ No newline at end of file