diff --git a/src/app/core/substance-ssg2/substance-ssg2-form.service.ts b/src/app/core/substance-ssg2/substance-ssg2-form.service.ts
index bdb1d9935..4f385016b 100644
--- a/src/app/core/substance-ssg2/substance-ssg2-form.service.ts
+++ b/src/app/core/substance-ssg2/substance-ssg2-form.service.ts
@@ -1424,7 +1424,10 @@ export class SubstanceSsg2FormService implements OnDestroy {
       substanceString = JSON.stringify(substanceCopy);
 
       deletedUuids.forEach(uuid => {
-        substanceString = substanceString.replace(new RegExp(`"${uuid}"`, 'g'), '');
+        const pattern = /^[a-fA-F0-9]{8}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{12}$/;
+        if(pattern.test(uuid)) {
+          substanceString = substanceString.replace(new RegExp(`"${uuid}"`, 'g'), '');
+        }
       });
       substanceString = substanceString.replace(/,[,]+/g, ',');
       substanceString = substanceString.replace(/\[,/g, '[');