AccountInfo() and SymbolInfo() return 0 on MT4 startup

When I attach a custom indicator to a chart, close MT4 and reopen it, the indicator initialises normally but every instance of AccountInfo() or SymbolInfo() in the first run of start() returns 0.0, causing several functions to throw a 'zero divide' error. When I reinitialise the indicator (without closing MT4), AccountInfo() and SymbolInfo() return the values they usually do. If I comment out all functions that are dependent on these two, the indicator initialises without throwing errors after restarting MT4.

Has anybody had a similar issue?

To clarify: the problem only arises when I attach the indicator to the chart, close MT4 and reopen it again; when I attach it when MT4 is already open, AccountInfo() and SymbolInfo() return normal values.

Additional information:

using #property strict
using start() instead of OnCalculate() (so I can run the main function manually without waiting for a new tick)
the requested account or symbol property has no influence on the problem

Solution

It happens quite often that some data is not available in MT4 at some moment of time. The best thing you can do is to check whether the result is accepted (>0 if you call time, quotes, other data that cannot be zero) or to check the last error, then Sleep(50) and try again. Most likely 2-5th attempt is successful so you need that in a loop.

It is possible that you need to know at least Account Number that cannot be zero. After you receive succesful result, all other data seems to loaded correctly.

int OnInit()
   {
    if(!initializeAccountInfo())
       return(INIT_FAILED);
    // ... other checks that you need
    return(INIT_SUCCEEDED);
   }
bool initializeAccountInfo()
   {
    int accountNumber=0, attempt=0, ATTEMPTS=50, SLEEP(50);
    while(attempt<ATTEMPTS)
       {
        accountNumber=AccountInfoInteger(ACCOUNT_LOGIN);
        attempt++;
        if(accountNumber==0)
           Sleep(SLEEP);
        else
           break;
       }
    return accountNumber>0;
   }