Error Access violation read to 0x00000000

[ECRG]

I have made a EA to get some data and insert it into my sql database but I got this error when I try to insert  , the insert function is in a timer .

    bool insertMt4Finance(){

          string queryInsertMt4String;

     

    

    

         if(userExist()){ 

    

       string serveur,currency,createdon,login;    double firstdeposit;    serveur  = (string)AccountInfoString(ACCOUNT_SERVER);    currency  = (string)AccountInfoString(ACCOUNT_CURRENCY);      createdon = TimeToString(TimeLocal(), TIME_DATE|TIME_SECONDS);            login = (string)AccountInfoInteger(ACCOUNT_LOGIN);    firstdeposit = AccountInfoDouble(ACCOUNT_BALANCE);

           double profit,credit;    profit  = AccountInfoDouble(ACCOUNT_PROFIT);    credit  = AccountInfoDouble(ACCOUNT_CREDIT);

       

           queryInsertMt4String = "INSERT INTO `MT4_FINANCE`(mt4_finance_uid,mt4_id,mt4_balance,mt4_profit,mt4_bonus,mt4_financeDate) VALUES ("+ GetUniqueInstanceName(login) + "," + login + "," + firstdeposit + "," + DailyProfit() + "," + credit + ",'" + createdon + "')";    uchar queryInsertMt4[];    StringToCharArray(queryInsertMt4String,queryInsertMt4,0,StringLen(queryInsertMt4String));

           int length=StringLen(queryInsertMt4String);    mysql_real_query(mysql,queryInsertMt4,length);

           Print("Row Insert Success, insertMt4Finance");    return true;

           }else { Print("Account Does Not Existe , insertMt4Finance");    return false;    }

    

    

    

    }

I thinks is a error from the SQL file DLL: 

This error appear on expert section on MT4

   Error Access violation read to 0x00000000

Thanks 

[Alain Verleyen]

• Use MT4 section for mql4/MT4 question.
• Format your code correctly if you want help.
• https://www.mql5.com/en/articles/932
  

[Keith Watford]

Topics concerning MT4 and MQL4 have their own section.

In future please post in the correct section.

I have moved your topic to the MQL4 and Metatrader 4 section.