diff --git a/backend/src/graphql/resolver/ContributionResolver.ts b/backend/src/graphql/resolver/ContributionResolver.ts
index a81a47339..ac6c99544 100644
--- a/backend/src/graphql/resolver/ContributionResolver.ts
+++ b/backend/src/graphql/resolver/ContributionResolver.ts
@@ -567,9 +567,13 @@ export class ContributionResolver {
         logger.error(`Contribution not found for given id: ${id}`)
         throw new Error('Contribution not found to given id.')
       }
+      if (contribution.confirmedAt) {
+        logger.error(`Contribution already confirmd: ${id}`)
+        throw new Error('Contribution already confirmd.')
+      }
       if (contribution.contributionStatus === 'DENIED') {
-        logger.error(`Contribution state (${contribution.contributionStatus}) can't be confirmed`)
-        throw new Error("Contribution state can't be confirmed")
+        logger.error(`Contribution already denied: ${id}`)
+        throw new Error('Contribution already denied.')
       }
       const moderatorUser = getUser(context)
       if (moderatorUser.id === contribution.userId) {