diff --git a/lib/index.js b/lib/index.js
index f125adf3..f069ca8d 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -654,10 +654,13 @@ export function _checkCredential({
   }
 
   if('credentialStatus' in credential) {
-    if(Array.isArray(credential.credentialStatus) ? credential.credentialStatus.some(cs => !cs.id) : !credential.credentialStatus.id) {
+    const {credentialStatus} = credential;
+    if(Array.isArray(credentialStatus) ?
+      credentialStatus.some(cs => !cs.id) : !credentialStatus.id) {
       throw new Error('"credentialStatus" must include an id.');
     }
-    if(Array.isArray(credential.credentialStatus) ? credential.credentialStatus.some(cs => !cs.type) : !credential.credentialStatus.type) {
+    if(Array.isArray(credentialStatus) ?
+      credentialStatus.some(cs => !cs.type) : !credentialStatus.type) {
       throw new Error('"credentialStatus" must include a type.');
     }
   }