iterate through QHash

[rosenth]

I made a loop :

QHashIterator<QString, QString> i(customers);
             while (i.hasNext())
            {
 
                QString dir=(i.value().left(1)=="-")?"1":"0";
...

QHashIterator<QString, QString> i(customers);
             while (i.hasNext())
            {

                QString dir=(i.value().left(1)=="-")?"1":"0";
...

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but runtime error is on i.value():

The inferior stopped because it received a signal from
the operating system.
signal name: SIGABRT
signal meaning: Aborted

The inferior stopped because it received a signal from
the operating system.
signal name: SIGABRT
signal meaning: Aborted

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whats problem?