diff --git a/src/services/service.ts b/src/services/service.ts
index faf381e..c181853 100755
--- a/src/services/service.ts
+++ b/src/services/service.ts
@@ -848,7 +848,7 @@ export default class Services {
       try {
         const parentIdHash = pcdCommitment['parent_id'];
         const diff = await this.getDiffByValue(parentIdHash);
-        if (diff['new_value'] === processId) {
+        if (diff && diff['new_value'] === processId) {
           res.push(process);
         }
       } catch (e) {