diff --git a/lib/input.js b/lib/input.js
index 75f90ba..3e1d0f5 100644
--- a/lib/input.js
+++ b/lib/input.js
@@ -232,9 +232,10 @@ export default class Input {
       const r = buf.slice(33 + off, 65 + off);
       const s = buf.slice(65 + off, 97 + off);
       const v = buf.readUInt8(97 + off);
-      const signer = Input.recoverSignerAddress(sigHashBuf, v, r, s);
-
-      input.setSig(r, s, v, signer);
+      if (v > 0) {
+        const signer = Input.recoverSignerAddress(sigHashBuf, v, r, s);
+        input.setSig(r, s, v, signer);
+      }
 
       return input;
     }
diff --git a/lib/transaction.spec.js b/lib/transaction.spec.js
index 55a9abd..3f0d05c 100644
--- a/lib/transaction.spec.js
+++ b/lib/transaction.spec.js
@@ -311,6 +311,23 @@ describe('transactions', () => {
     assert.equal(condition.inputs[1].signer, ADDR);
   });
 
+  it('should allow to create and parse spending condition tx without signed input.', () => {
+    const prevTx = '0x7777777777777777777777777777777777777777777777777777777777777777';
+    const value = BigInt('99000000');
+    const color = 1337;
+    const condition = Tx.spendCond(
+      [new Input({
+        prevout: new Outpoint(prevTx, 0),
+        script: '0x123456',
+      }), new Input({
+        prevout: new Outpoint(prevTx, 1),
+      })
+      ], [new Output(value, ADDR, color)],
+    );
+    condition.inputs[0].setMsgData('0xabcdef');
+    assert.deepEqual(Tx.fromRaw(condition.toRaw()), condition);
+  });
+
   it('should allow to create and parse spending condition with different tokens', () => {
     const prevTx = '0x7777777777777777777777777777777777777777777777777777777777777777';
     const NFT_COLOR_BASE = 32769; // 2^15 + 1