MQL4 ERR_INVALID_TICKET
MQL4 error 4108 invalid ticket maps to ERR_INVALID_TICKET: invalid ticket. The requested order ticket does not identify a selectable live or historical order in the expected pool. Capture GetLastError immediately after the failed call, correct the cause, and retry only when the condition can change.
Open the Coding Agent, then choose MQL4 from the language menu.
#property strict
#property script_show_inputs
input int Ticket = 0;
input int StopPoints = 200;
void OnStart()
{
if(Ticket <= 0 || !OrderSelect(Ticket, SELECT_BY_TICKET))
{
Print("OrderSelect failed. error=", GetLastError());
return;
}
RefreshRates();
double stop_loss = NormalizeDouble(Bid - StopPoints * Point, Digits);
if(MathAbs(OrderStopLoss() - stop_loss) < Point / 2.0)
{
Print("No OrderModify call: the stop loss is unchanged.");
return;
}
ResetLastError();
bool changed = OrderModify(OrderTicket(), OrderOpenPrice(), stop_loss,
OrderTakeProfit(), 0, clrNONE);
if(!changed)
Print("OrderModify failed. error=", GetLastError(),
" ticket=", OrderTicket(),
" stop=", DoubleToString(stop_loss, Digits));
}The official MQL4 runtime table names error 4108 ERR_INVALID_TICKET and defines it as “invalid ticket.” The requested order ticket does not identify a selectable live or historical order in the expected pool.
The error number is evidence about one failed call, not a diagnosis of the whole EA. Read the API sentinel first, then call GetLastError immediately because that function returns the current _LastError value and resets it.
Start with the inputs and external state that existed at the failure point. A later log entry or a successful call can overwrite the useful context.
Do not retry the same invalid identifier. Refresh the order state and obtain a valid ticket from a successful selection or order result.
Keep the original trading and risk rules intact. A workaround that widens stops, increases volume, changes an account setting, or ignores a failed return value can hide the symptom while changing the system.
| Check | Action |
|---|---|
| The ticket is zero, negative, stale, or never assigned | Reject non-positive tickets and initialize ticket variables explicitly. |
| The order closed before the management code ran | Re-select the ticket and branch when it has moved to history. |
| A position index is passed where a ticket number is required | Keep order-pool positions separate from persistent ticket identifiers. |
| The EA modifies a ticket without a successful OrderSelect | Require successful OrderSelect before reading or modifying order fields. |
The script validates the ticket and requires OrderSelect before reading any order property or calling OrderModify.
The example improves validation and logging. It does not prove the operation will be accepted by a broker or behave safely in live trading.
#property strict
#property script_show_inputs
input int Ticket = 0;
input int StopPoints = 200;
void OnStart()
{
if(Ticket <= 0 || !OrderSelect(Ticket, SELECT_BY_TICKET))
{
Print("OrderSelect failed. error=", GetLastError());
return;
}
RefreshRates();
double stop_loss = NormalizeDouble(Bid - StopPoints * Point, Digits);
if(MathAbs(OrderStopLoss() - stop_loss) < Point / 2.0)
{
Print("No OrderModify call: the stop loss is unchanged.");
return;
}
ResetLastError();
bool changed = OrderModify(OrderTicket(), OrderOpenPrice(), stop_loss,
OrderTakeProfit(), 0, clrNONE);
if(!changed)
Print("OrderModify failed. error=", GetLastError(),
" ticket=", OrderTicket(),
" stop=", DoubleToString(stop_loss, Digits));
}Pineify can generate or revise one self-contained .mq4 file with MQL4-specific reference context. Its independent static checker returns MetaEditor diagnostics so you can repair source issues before testing in your own MT4 environment.
Open MQL4 Coding AgentStatic diagnostics do not prove runtime behavior, backtest results, broker compatibility, or live-trading safety.
Check the API return value before interpreting an error number from the log.
Call GetLastError immediately and record error 4108, symbol, prices, volume, ticket, and terminal state relevant to the operation.
Reject non-positive tickets and initialize ticket variables explicitly.
Compile the revised source, then test with the same MT4 build, broker, symbol, account permissions, and market state.
ERR_INVALID_TICKET means invalid ticket. The code should still identify which API returned failure and log the inputs used for that call.
The ticket is zero, negative, stale, or never assigned The order closed before the management code ran A position index is passed where a ticket number is required The EA modifies a ticket without a successful OrderSelect
Do not retry the same invalid identifier. Refresh the order state and obtain a valid ticket from a successful selection or order result.
It reports the current _LastError value and resets it. Other operations can change the error state, so a delayed read may describe the wrong call.
Pineify can revise a self-contained .mq4 file, add validation and error logging, and return static MetaEditor diagnostics. It cannot prove broker acceptance, account permissions, market availability, or live execution.
Last verified against the linked official references on . Compile and test the final source in the MetaTrader 4 build, broker, symbol, and account environment you plan to use.
Define the requirement, inspect the generated source, repair diagnostics, and test the behavior in your own MT4 environment.
Open Coding Agent