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MQL5 runtime error reference

MQL5 Error 4753: Position not found

MQL5 error 4753 officially means "Position not found." A position lookup or operation used a symbol or ticket that does not identify a current position, or the position changed before the call completed. Select the position immediately before reading or modifying it, use the correct symbol or ticket for the account margin mode, and treat a missing position as normal state when another transaction may already have closed it. Capture GetLastError immediately around the failing call so an older error is not mistaken for the current failure.

Open MQL5 Coding AgentReview the diagnostic example

Open the Coding Agent and choose MQL5 from the language menu.

Isolate runtime error 4753.mq5
bool ReadCurrentPosition(const ulong ticket)
  {
   ResetLastError();
   if(!PositionSelectByTicket(ticket))
     {
      PrintFormat("Position %I64u not found, error=%d",ticket,GetLastError());
      return false;
     }

   PrintFormat("symbol=%s volume=%.2f",
               PositionGetString(POSITION_SYMBOL),
               PositionGetDouble(POSITION_VOLUME));
   return true;
  }
  • Official meaning: Position not found
  • Layer: terminal runtime
  • Read with: GetLastError
  • First step: isolate the failing call

Where error 4753 comes from

A position lookup or operation used a symbol or ticket that does not identify a current position, or the position changed before the call completed. The numeric value is listed in the official runtime error table, which is separate from MetaEditor compilation errors and trade server return codes.

Reset the last-error state before the suspected call, save its direct return value, and read GetLastError immediately afterward. This produces a causal log instead of a stale code.

Checks that narrow the cause

Preserve the exact parameters and terminal context that produced the failure. Check one precondition at a time before adding retries.

  • Use PositionSelect for a symbol lookup or PositionSelectByTicket for a ticket lookup.
  • Do not reuse a cached ticket without confirming that it still exists.
  • Check ACCOUNT_MARGIN_MODE when code assumes one position per symbol.
  • Reconcile state in OnTradeTransaction after fills and closes.

Apply the smallest repair

Select the position immediately before reading or modifying it, use the correct symbol or ticket for the account margin mode, and treat a missing position as normal state when another transaction may already have closed it.

After the repair, test both the expected path and a deliberately invalid input. The second test confirms that the diagnostic branch still exposes failures.

Use a focused diagnostic

The example selects by ticket immediately before reading position properties and treats a disappeared position as a state change rather than dereferencing stale data.

A clean compile or a cleared error code does not prove strategy logic, broker compatibility, backtest quality, or live-trading safety. Reproduce the result in the target MetaTrader 5 terminal and account environment.

Isolate runtime error 4753.mq5
bool ReadCurrentPosition(const ulong ticket)
  {
   ResetLastError();
   if(!PositionSelectByTicket(ticket))
     {
      PrintFormat("Position %I64u not found, error=%d",ticket,GetLastError());
      return false;
     }

   PrintFormat("symbol=%s volume=%.2f",
               PositionGetString(POSITION_SYMBOL),
               PositionGetDouble(POSITION_VOLUME));
   return true;
  }
Where Pineify fits

Repair editable MQL5 source with compiler feedback

Pineify can generate or revise MQL5 source and use MQL5 compilation diagnostics during the coding workflow. Keep the exact error, source location, program type, and intended behavior in the request so the change remains reviewable.

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Pineify does not run your broker terminal, Strategy Tester, market data, or live orders. Validate the final program in your own MetaTrader 5 environment.

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A practical verification workflow

  1. 1

    Reset the error state

    Call ResetLastError directly before the suspected function so the next code belongs to that operation.

  2. 2

    Record call and inputs

    Save the function return value, every input, and GetLastError. Confirm that the captured runtime code is 4753.

  3. 3

    Validate the preconditions

    Use PositionSelect for a symbol lookup or PositionSelectByTicket for a ticket lookup. Do not reuse a cached ticket without confirming that it still exists. Check ACCOUNT_MARGIN_MODE when code assumes one position per symbol. Reconcile state in OnTradeTransaction after fills and closes.

  4. 4

    Retest in the target terminal

    Compile the changed source, repeat the failing operation, and test the surrounding EA or indicator behavior in MetaTrader 5.

Frequently asked questions

What does MQL5 error 4753 mean?

The official runtime error table defines 4753 as "Position not found."

Is error 4753 a compiler error?

No in this context. It is a terminal runtime code. Compiler diagnostics and MqlTradeResult.retcode values use separate code tables.

Why should I call ResetLastError first?

The terminal stores the last runtime error. Resetting it before the suspected call makes the following GetLastError value easier to attribute to that call.

Last verified against the linked official references on . Compile and test the final source in the MetaTrader 5 build, broker, symbol, and account environment you plan to use.

Continue with reviewable MQL5 source

Provide the exact diagnostic and intended behavior, inspect the generated change, compile it, and verify it in your MT5 test environment.

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