diff --git a/System/Jwt/Jwt.php b/System/Jwt/Jwt.php
index 916241ec..5a1fb295 100644
--- a/System/Jwt/Jwt.php
+++ b/System/Jwt/Jwt.php
@@ -49,10 +49,11 @@ class Jwt extends Component
 			$this->setEncrypt($jwt['encrypt'] ?? JWTConstant::AES_128_ECB);
 			$this->setKey($jwt['key'] ?? get_called_class());
 
-			var_dump($this->encrypt);
-
-			$defaultIv = openssl_random_pseudo_bytes(openssl_cipher_iv_length($this->encrypt));
-			$this->setIv($jwt['iv'] ?? $defaultIv);
+			$length = openssl_cipher_iv_length($this->encrypt);
+			if ($length > 0) {
+				$defaultIv = openssl_random_pseudo_bytes($length);
+				$this->setIv($jwt['iv'] ?? $defaultIv);
+			}
 		}
 	}