diff --git a/parse.py b/parse.py
index fe5bdf4..2bdea53 100644
--- a/parse.py
+++ b/parse.py
@@ -396,6 +396,8 @@ def voucher_transfer_handler(cmd):
         s = data[voucher_name]
    elif str(cmd.a).startswith("AddressAgent"):
         s = "0x" + str(cmd.a).split(":")[1] 
+   else: 
+       raise ValueError(f"Invalid command: {cmd.t}. Expected 'NameAgent' or 'AddressAgent'.")
 
    if str(cmd.t).startswith("NameAgent"):
         key_name = str(cmd.t).split(":")[1] 
@@ -404,7 +406,9 @@ def voucher_transfer_handler(cmd):
         acct = w3.eth.account.from_key(data["private_key"])
         to = acct.address
    elif str(cmd.t).startswith("AddressAgent"):
-        to = "0x" + str(cmd.t).split(":")[1] 
+        to = "0x" + str(cmd.t).split(":")[1]
+   else: 
+       raise ValueError(f"Invalid command: {cmd.t}. Expected 'NameAgent' or 'AddressAgent'.") 
 
    command = (
     f'cast send --private-key {privatekey} '
@@ -432,6 +436,8 @@ def voucher_mint_handler(cmd):
         to = acct.address
     elif str(cmd.t).startswith("AddressAgent"):
         to = "0x" + str(cmd.t).split(":")[1] 
+    else:
+        raise ValueError(f"Invalid command: {cmd.t}. Expected 'NameAgent' or 'AddressAgent'.")
 
     if str(cmd.a).startswith("NameAgent"):
         voucher_name  = str(cmd.a).split(":")[1] 
@@ -441,6 +447,8 @@ def voucher_mint_handler(cmd):
         privatekey = data["owner"]
     elif str(cmd.a).startswith("AddressAgent"):
         s = "0x" + str(cmd.a).split(":")[1] 
+    else:
+        raise ValueError(f"Invalid command: {cmd.t}. Expected 'NameAgent' or 'AddressAgent'.")
 
     command = (
         f'cast send --private-key  {privatekey} '