MetaTrader 5.00 Build 687 StringConcatenate error

[L..]

StringConcatenate error in MetaTrader 5.00 Build 687, when output string was not initialized yet, and at least one of the parameters is an imported function with string return type. (tested with Strategy tester)

example code fragment

#import ...

string getCmdStr( int cmd);
// ...

string s1;    StringConcatenate(s1, "prefix", getCmdStr(cmd)); Print(s1);  // output:  prefixprefix
string s2=""; StringConcatenate(s2, "prefix", getCmdStr(cmd)); Print(s2);  // output:  prefixSELL
Print("prefix", getCmdStr(cmd));  // output:  prefixSELL

[Rashid Umarov]

Could you write to Servicedesk with all details? Thank you.