[Gate-users] warning in SPECT simulation

[Saeed Heidary]

Dear GATE users
I am using my own changed benchSPECT based on these characteristics ;

two head and 32 projections ,rotating in 180 deg using a NCAT phantom.
during the first projection this warning is appeared but GATE is doing
its progress
and is not stopped .
Anybody has encountered such a warning!
 Is it a serious warning and maybe affects the simulation ?

clearing up the projection data matrices ... done
WARNING - G4Navigator::ComputeStep()
          Track stuck, not moving for 10 steps
          in volume -collimator_phys- at point (171.89,-160.45,-131.711)
          direction: (0.856014,-0.463663,-0.228597).
          Potential geometry or navigation problem !
          Trying pushing it of 1e-07 mm ...

Many thanks