Add method exists for addClaim on token

Author: Sephster

src/Grant/AbstractGrant.php

@@ -454,8 +454,10 @@ protected function issueAccessToken(
         $accessToken->setExpiryDateTime((new DateTimeImmutable())->add($accessTokenTTL));
         $accessToken->setPrivateKey($this->privateKey);
 
-        foreach ($claims as $claim) {
-            $accessToken->addClaim($claim);
+        if (method_exists($accessToken, 'addClaim')) {
+            foreach ($claims as $claim) {
+                $accessToken->addClaim($claim);
+            }
         }
 
         while ($maxGenerationAttempts-- > 0) {