diff --git a/crates/blockchain/src/aggregation.rs b/crates/blockchain/src/aggregation.rs
index 8fe3e2d2..9e1bfb97 100644
--- a/crates/blockchain/src/aggregation.rs
+++ b/crates/blockchain/src/aggregation.rs
@@ -205,9 +205,14 @@ fn build_job(
 
     let (children, accepted_child_ids) = resolve_child_pubkeys(&child_proofs, validators);
 
+    // Skip aggregation when there's nothing to aggregate
     if raw_ids.is_empty() && children.len() < 2 {
         return None;
     }
+    // Skip aggregation when there's only a single raw signature to aggregate.
+    if children.is_empty() && raw_ids.len() <= 1 {
+        return None;
+    }
 
     let keys_to_delete: Vec<(u64, H256)> = validator_sigs
         .into_iter()