diff --git a/scanner/src/commands.rs b/scanner/src/commands.rs
index f028f10..e647884 100644
--- a/scanner/src/commands.rs
+++ b/scanner/src/commands.rs
@@ -367,7 +367,7 @@ impl Migrate {
                             &tx.to_lowercase(),
                             &block.to_lowercase(),
                             &sender,
-                            opt.claim.body.amount,
+                            opt.claim.body.amount.unwrap_or(0),
                             height,
                             timestamp,
                             &op_copy,
diff --git a/scanner/src/rpc.rs b/scanner/src/rpc.rs
index 792125a..f5ee09a 100644
--- a/scanner/src/rpc.rs
+++ b/scanner/src/rpc.rs
@@ -393,7 +393,7 @@ impl RPCCaller {
                                 tx_hash: tx_hash.clone(),
                                 block_hash: block_hash.clone(),
                                 sender: signer,
-                                amount: opt.claim.body.amount,
+                                amount: opt.claim.body.amount.unwrap_or(0),
                                 height,
                                 timestamp: timestamp.timestamp(),
                                 content: op_copy,
diff --git a/scanner/src/types.rs b/scanner/src/types.rs
index 1c1aed1..3593ea0 100644
--- a/scanner/src/types.rs
+++ b/scanner/src/types.rs
@@ -299,7 +299,7 @@ pub struct Claim {
 
 #[derive(Serialize, Deserialize, Debug)]
 pub struct ClaimOptBody {
-    pub amount: i64,
+    pub amount: Option<i64>,
 }
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////