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Hello,

This is my first mail in this mail-list so I'm sorry if I'm making it wrong.

Focusing in the possible bug, in the SparseGrid2D class, in the function
reduceObjectsAtLocations() (line 620), there is a call to the method
getObjectsAtLocation() in the line 636, which may return a null value, the
code is:

Bag temp = getObjectsAtLocation(xs[i],ys[i]);      //line 636 this can
return 'null'
int size = temp.numObjs;                                     //line 637


And as you can see, if the value of "temp" is null, the line 637 will throw
a null pointer exception as it's happening to me.

I hope this report can be useful ;-)

Regards,
Javier