ParallelTTracker crashes when using particle matter integration and space charge solver if all particles are in material

ParallelTTracker [2]> --- CollimatorPhysics - Name AIR1 Material AIR
ParallelTTracker [2]> Particle Statistics @ 12:29:52
ParallelTTracker [2]>             entered: 1
ParallelTTracker [2]>          rediffused: 0
ParallelTTracker [2]>             stopped: 0
ParallelTTracker [2]>   total in material: 50'000
Error> 
Error> *** User error detected by function "boundp() "
Error>     h<0, can not build a mesh
Error>     h<0, can not build a mesh
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MPI_ABORT was invoked on rank 0 in communicator MPI_COMM_WORLD
with errorcode -100.

NOTE: invoking MPI_ABORT causes Open MPI to kill all MPI processes.
You may or may not see output from other processes, depending on
exactly when Open MPI kills them.
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