the value returned by CopyBuffer cannot be divided during debugging

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Can you help me?

This is all my code:

double ma5[];
int ma5_handle=0;
int OnInit()
  {
   EventSetTimer(10);
   return(INIT_SUCCEEDED);
  }
void OnDeinit(const int reason)
  {
   EventKillTimer();
  }
void OnTimer()
  {
   string symbol=_Symbol;
   ENUM_TIMEFRAMES period=PERIOD_CURRENT;
   ArraySetAsSeries(ma5,true);
   int ma5_handle=iMA(symbol,period,5,0,MODE_SMA,PRICE_CLOSE);
   CopyBuffer(ma5_handle,0,0,20,ma5);
   double a=1/ma5[12];
   Print(_Symbol," ",ma5[0]," ",ma5[12]);
  }

An error "Zero devided"  is reported on the third row code from the bottom：double a=1/ma5[12];

When I delete it, the value of the indicator ma5[12] is not zero !

Why can't it be divided?

 
our topic has been moved to the section: Expert Advisors and Automated Trading
Please consider which section is most appropriate — https://www.mql5.com/en/forum/172166/page6#comment_49114893
 
read the online documents on how to load handles.
  
double ma5[];
int ma5_handle=
INVALID_HANDLE ;
int OnInit()
  {
   ArraySetAsSeries(ma5,true);
   ma5_handle=iMA(_Symbol,PERIOD_CURRENT,5,0,MODE_SMA,PRICE_CLOSE);
   EventSetTimer(10);
   return(INIT_SUCCEEDED);
  }
void OnDeinit(const int reason)
  {
   EventKillTimer();
  }
void OnTimer()
  {
   if (CopyBuffer(ma5_handle,0,0,20,ma5) == 20)
   {
      double a=1/ma5[12];
      Print(_Symbol," ",ma5[0]," ",ma5[12], " ", a);
   }
  }

try it out

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