Token passed to strip decoder can be of length zero

Author: CodeWithKyrian

src/Decoders/StripDecoder.php

@@ -28,7 +28,7 @@ protected function decodeChain(array $tokens): array
         return array_map(function ($token) {
             $startCut = 0;
             for ($i = 0; $i < $this->start; ++$i) {
-                if ($token[$i] === $this->content) {
+                if ($token[$i] ?? null === $this->content) {
                     $startCut = $i + 1;
                     continue;
                 } else {
@@ -39,7 +39,7 @@ protected function decodeChain(array $tokens): array
             $stopCut = strlen($token);
             for ($i = 0; $i < $this->stop; ++$i) {
                 $index = strlen($token) - $i - 1;
-                if ($token[$index] === $this->content) {
+                if ($token[$index] ?? null === $this->content) {
                     $stopCut = $index;
                     continue;
                 } else {