AccountInfo() and SymbolInfo() return 0 on MT4 startup - mql4

Question

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

Answer 1

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;
}