diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8a753ace5..db7da54fa 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -82,6 +82,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Improvements
 
+- [#1246](https://github.com/alleslabs/celatone-frontend/pull/1246) Handle undefined constructor args
 - [#1242](https://github.com/alleslabs/celatone-frontend/pull/1242) Improve EVM proxy contract details and checksum address
 - [#1236](https://github.com/alleslabs/celatone-frontend/pull/1236) Remove unnecessary configs for users in custom network configs
 - [#1228](https://github.com/alleslabs/celatone-frontend/pull/1228) Refactor EVM verification form path and form type location
diff --git a/src/lib/services/verification/evm/api.ts b/src/lib/services/verification/evm/api.ts
index a1f3275c3..3c171db86 100644
--- a/src/lib/services/verification/evm/api.ts
+++ b/src/lib/services/verification/evm/api.ts
@@ -68,7 +68,9 @@ const submitEvmVerifySolidityContractCode = async ({
       license: licenseType,
       bytecode_type: BYTECODE_TYPE,
       compiler_version: compilerVersion,
-      constructor_arguments: constructorArgs.value,
+      constructor_arguments: constructorArgs.enabled
+        ? constructorArgs.value
+        : undefined,
       metadata: {
         chain_id: chainId,
         contract_address: contractAddress,
@@ -107,7 +109,9 @@ const submitEvmVerifySolidityUploadFiles = async ({
   formData.append("language", "Solidity");
   formData.append("bytecode_type", BYTECODE_TYPE);
   formData.append("compiler_version", compilerVersion);
-  formData.append("constructor_arguments", constructorArgs.value);
+  if (constructorArgs.enabled) {
+    formData.append("constructor_arguments", constructorArgs.value);
+  }
   formData.append(
     "metadata",
     JSON.stringify({
@@ -157,7 +161,9 @@ const submitEvmVerifyVyperContractCode = async ({
       bytecode_type: BYTECODE_TYPE,
       contract_name: contractName,
       compiler_version: compilerVersion,
-      constructor_arguments: constructorArgs.value,
+      constructor_arguments: constructorArgs.enabled
+        ? constructorArgs.value
+        : undefined,
       metadata: {
         chain_id: chainId,
         contract_address: contractAddress,
@@ -193,7 +199,9 @@ const submitEvmVerifyVyperUploadFiles = async ({
   formData.append("language", "Vyper");
   formData.append("bytecode_type", BYTECODE_TYPE);
   formData.append("compiler_version", compilerVersion);
-  formData.append("constructor_arguments", constructorArgs.value);
+  if (constructorArgs.enabled) {
+    formData.append("constructor_arguments", constructorArgs.value);
+  }
   formData.append(
     "metadata",
     JSON.stringify({
@@ -242,7 +250,9 @@ const submitEvmVerifyJsonInput = async ({
       license: licenseType,
       bytecode_type: BYTECODE_TYPE,
       compiler_version: compilerVersion,
-      constructor_arguments: constructorArgs.value,
+      constructor_arguments: constructorArgs.enabled
+        ? constructorArgs.value
+        : undefined,
       metadata: {
         chain_id: chainId,
         contract_address: contractAddress,