diff --git a/waku/waku_rln_relay/group_manager/on_chain/group_manager.nim b/waku/waku_rln_relay/group_manager/on_chain/group_manager.nim
index 71d67c02a..270fa62a4 100644
--- a/waku/waku_rln_relay/group_manager/on_chain/group_manager.nim
+++ b/waku/waku_rln_relay/group_manager/on_chain/group_manager.nim
@@ -298,7 +298,7 @@ method generateProof*(
     epoch: Epoch,
     messageId: MessageId,
     rlnIdentifier = DefaultRlnIdentifier,
-): Future[GroupManagerResult[RateLimitProof]] {.async.} =
+): GroupManagerResult[RateLimitProof] {.gcsafe, raises: [].} =
   ## Generates an RLN proof using the cached Merkle proof and custom witness
   # Ensure identity credentials and membership index are set
   if g.idCredentials.isNone():
@@ -308,6 +308,9 @@ method generateProof*(
   if g.userMessageLimit.isNone():
     return err("user message limit is not set")
 
+  debug "calling generateProof from generateProof from group_manager onchain",
+    data = data
+
   let externalNullifierRes = poseidon(@[@(epoch), @(rlnIdentifier)])
 
   let witness = Witness(