Error- root stops working

Whenever I type in the command “gGeoManager->SetCurrentPoint(x,y,z)”, my root crashes and stops working. What is the possible source of error?? I have intialized x,y,z to be Double_t type and also intialized an instance of TGeoNavigator Class.

Can you post a small script reproducing the crash ? is gGeoManager defined ?
For more help @agheata would be the expert.

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