diff --git a/packages/protocol/src/protocol-thp/decode.ts b/packages/protocol/src/protocol-thp/decode.ts
index 085c4d01f0..46eff1f5ce 100644
--- a/packages/protocol/src/protocol-thp/decode.ts
+++ b/packages/protocol/src/protocol-thp/decode.ts
@@ -198,8 +198,6 @@ export const decodeSendAck = (decodedMessage: MessageV2) => {
     if (magic === THP_READ_ACK_HEADER_BYTE) {
         return decodeReadAck();
     }
-
-    throw new Error('Unexpected send response: ' + magic);
 };
 
 // Decode protocol-v2 message from thp receive process
diff --git a/packages/protocol/tests/protocol-thp/protocol-thp.test.ts b/packages/protocol/tests/protocol-thp/protocol-thp.test.ts
index a3f33d6817..497e7fd656 100644
--- a/packages/protocol/tests/protocol-thp/protocol-thp.test.ts
+++ b/packages/protocol/tests/protocol-thp/protocol-thp.test.ts
@@ -96,15 +96,14 @@ describe('protocol-thp', () => {
     });
 
     it('decodeSendAck', () => {
-        const thpError2 = decodeSendAck(decodeV2(Buffer.from('42122200050270303cfa', 'hex')));
-        expect(thpError2.type).toBe('ThpError');
+        const thpError = decodeSendAck(decodeV2(Buffer.from('42122200050270303cfa', 'hex')));
+        expect(thpError?.type).toBe('ThpError');
 
         const ack = decodeSendAck(decodeV2(Buffer.from('2812340004e98c8599', 'hex')));
-        expect(ack.type).toBe('ThpAck');
+        expect(ack?.type).toBe('ThpAck');
 
-        expect(() => decodeSendAck(decodeV2(Buffer.from('40ffff0004f9215951', 'hex')))).toThrow(
-            'Unexpected send response',
-        );
+        const unexpected = decodeSendAck(decodeV2(Buffer.from('40ffff0004f9215951', 'hex')));
+        expect(unexpected).toBe(undefined);
 
         expect(() => decodeSendAck(decodeV2(Buffer.from('40ffff000499999999', 'hex')))).toThrow(
             'Invalid CRC',
diff --git a/packages/transport/src/thp/send.ts b/packages/transport/src/thp/send.ts
index d021a0b47a..0a51cd825e 100644
--- a/packages/transport/src/thp/send.ts
+++ b/packages/transport/src/thp/send.ts
@@ -94,7 +94,7 @@ export const sendThpMessage = async ({
         // parse and check the result
         const decodedResult = protocolThp.decodeSendAck(protocolV2.decode(result.payload));
         // fail on ThpError
-        if (decodedResult.type === 'ThpError') {
+        if (decodedResult?.type === 'ThpError') {
             const { code, message } = decodedResult.message;
 
             return error({ error: code, message });