ctools

A ctlike run on 2 COMPTEL observations gave the following exception:

2012-12-06T11:36:52:  Iteration 25: func=-134518, Lambda=1e-14, delta=6.62477, max(grad)=80.8315 [0]
2012-12-06T11:36:56:  Iteration 26: func=-134523, Lambda=1e-15, delta=4.93667, max(grad)=63.8959 [0]
2012-12-06T11:37:00:  Iteration 27: func=-134526, Lambda=1e-16, delta=3.07109, max(grad)=55.6258 [1]
2012-12-06T11:37:00:  GOptimizerLM::iteration: Curvature matrix not positive definite.
2012-12-06T11:37:00:  Iteration 28: func=-134526, Lambda=1e-16, delta=0, max(grad)=55.6258 [1]
2012-12-06T11:37:00:    Free parameter "Index" after convergence was reached with frozen parameter.
2012-12-06T11:37:00:    Free parameter "Scale factor 0" after convergence was reached with frozen parameter.
2012-12-06T11:37:00:  *** ERROR encounterted in the execution of ctlike. Run aborted ...
2012-12-06T11:37:00:  *** ERROR in GSparseMatrix::operator(int&,int&): Matrix element (52,52) out of range ([0,51], [0,51])
2012-12-06T11:37:00:  
2012-12-06T11:37:00: Application "ctlike" terminated after 125 wall clock seconds, consuming 227.068 seconds of CPU time.

Maybe the problem comes from a non positive definite curvature matrix, but in any case, there should not be an invalid access to matrix elements. Something went wrong here.

Relevant files to reproduce the problem are attached.