unpredictable closing

This is a bug report to tell you, the XFCE desktop continue to be remplaced by the gnome one usualy (on the booting too but I had no report)

18:06 popi@popi-desktop ~% xfdesktop
OpenGL extension version - 1.2
WARNING : SetCurrent() called before widget was realized ; skipping...
GL is not yet initialized -> skipping light setup!
added local light.
PrintToLog[0] : A new project created.
WARNING : SetCurrent() called before widget was realized ; skipping...
WARNING : Update() called before widget was realized ; skipping...
InitGL : setting up lights for cam 0
draw state is 1
orbit_xy skipped ; counter = 1
erase state is 1
draw skipped ; counter = 1
draw state is 1
erase skipped ; counter = 1
current element is now Ru
rotate_xy state is 1
draw skipped ; counter = 1
orbit_xy state is 1
rotate_xy skipped ; counter = 1
now returning from gtk_project::GeomOptGetParam().
PrintToLog[1] : WARNING : could not determine atomtype (atom index = 1).
PrintToLog[2] : WARNING : could not determine atomtype (atom index = 2).
PrintToLog[3] : WARNING : could not determine atomtype (atom index = 3).
PrintToLog[0] : WARNING : could not determine atomtype (atom index = 4).
PrintToLog[1] : WARNING : could not determine atomtype (atom index = 5).
PrintToLog[2] : WARNING : could not determine atomtype (atom index = 6).
PrintToLog[3] : WARNING : could not determine atomtype (atom index = 7).
creating bt1-terms: 13 terms, 13 errors.
creating bt2-terms: 37 terms, 27 errors.
creating bt3-terms: 97 terms, 97 errors.
PrintToLog[0] : WARNING : there were 137 missing parameters in the bonded terms.
creating nbt1-terms: PrintToLog[1] : Starting Geometry Optimization (setup = allmm, engine = tripos5.2 implementation ported from ghemical-1.00).
PrintToLog[2] : Cycle Energy Gradient Step Delta E
PrintToLog[3] : 0 15650,04194 kJ/mol 1,6224e+05 2,6977e-01 **********
PrintToLog[0] : 5 9408,36414 kJ/mol 2,0016e+04 9,5140e-03 7,2783e+01
PrintToLog[1] : 10 9213,19258 kJ/mol 7,9133e+03 3,5744e-03 1,1105e+01
PrintToLog[2] : 15 9144,11073 kJ/mol 2,8113e+04 7,8050e-03 1,3143e+01
PrintToLog[3] : 20 9059,10987 kJ/mol 5,3123e+04 5,2430e-03 8,9753e+00
PrintToLog[0] : 25 9026,36244 kJ/mol 5,4461e+04 3,4272e-03 5,6840e+00
PrintToLog[1] : 30 9000,36089 kJ/mol 5,7102e+04 3,0648e-03 5,0217e+00
PrintToLog[2] : 35 8975,18823 kJ/mol 6,2448e+04 3,1450e-03 5,1102e+00
PrintToLog[3] : 40 8948,44100 kJ/mol 6,9797e+04 3,4255e-03 5,5310e+00
PrintToLog[0] : 45 8919,43026 kJ/mol 7,7442e+04 3,7146e-03 5,9668e+00
PrintToLog[1] : 50 8888,74342 kJ/mol 8,3608e+04 3,8931e-03 6,2230e+00
PrintToLog[2] : 55 8857,40163 kJ/mol 8,7318e+04 3,9401e-03 6,2698e+00
PrintToLog[3] : 60 8826,53046 kJ/mol 8,8347e+04 3,8332e-03 6,0763e+00
PrintToLog[0] : 65 8797,29025 kJ/mol 8,7109e+04 3,5978e-03 5,6806e+00
PrintToLog[1] : 70 8770,10648 kJ/mol 8,4538e+04 3,3647e-03 5,2883e+00
PrintToLog[2] : 75 8737,11978 kJ/mol 8,1350e+04 3,2807e-03 5,1109e+00
PrintToLog[3] : 80 8669,24934 kJ/mol 7,7431e+04 3,4326e-03 5,4846e+00
PrintToLog[0] : 85 8647,72640 kJ/mol 7,4222e+04 2,6058e-03 4,0311e+00
PrintToLog[1] : 90 8628,23400 kJ/mol 7,2472e+04 2,5152e-03 3,8650e+00
PrintToLog[2] : 95 8608,10110 kJ/mol 7,2246e+04 2,7713e-03 4,2233e+00
PrintToLog[3] : 100 6545,81234 kJ/mol 2,8314e+04 5,6768e-02 2,0438e+03
PrintToLog[0] : 105 5764,22174 kJ/mol 7,4491e+03 1,3900e-02 3,0801e+01
PrintToLog[1] : 110 5599,04256 kJ/mol 1,4692e+04 6,7738e-03 1,1474e+01
PrintToLog[2] : 115 5543,15221 kJ/mol 1,3899e+04 6,8563e-03 1,0286e+01
PrintToLog[3] : 120 5513,83781 kJ/mol 9,0613e+03 3,1201e-03 4,0030e+00
PrintToLog[0] : 125 5491,14864 kJ/mol 1,0258e+04 4,6609e-03 5,1288e+00
PrintToLog[1] : 130 5472,28854 kJ/mol 7,8680e+03 3,0592e-03 2,9542e+00
PrintToLog[2] : 135 5457,25067 kJ/mol 7,6589e+03 3,3122e-03 2,8211e+00
PrintToLog[3] : 140 5446,31007 kJ/mol 6,6434e+03 2,6285e-03 1,9716e+00
PrintToLog[0] : 145 5438,17103 kJ/mol 5,7447e+03 2,1476e-03 1,4162e+00
PrintToLog[1] : 150 5431,29724 kJ/mol 5,2469e+03 2,1579e-03 1,2631e+00
PrintToLog[2] : 155 5426,48812 kJ/mol 4,5122e+03 1,7100e-03 8,7755e-01
PrintToLog[3] : 160 5422,32821 kJ/mol 4,0278e+03 1,6163e-03 7,3645e-01
PrintToLog[0] : 165 5419,67654 kJ/mol 3,1371e+03 1,0846e-03 4,2890e-01
PrintToLog[1] : 170 5417,29950 kJ/mol 3,5380e+03 1,5361e-03 5,3483e-01
PrintToLog[2] : 175 5415,34339 kJ/mol 2,3735e+03 8,4303e-04 2,6153e-01
PrintToLog[3] : 180 5414,28131 kJ/mol 2,3230e+03 8,3733e-04 2,2096e-01
PrintToLog[0] : 185 5413,02173 kJ/mol 2,4205e+03 1,0565e-03 2,5083e-01
PrintToLog[1] : 190 5412,00017 kJ/mol 2,0210e+03 8,2818e-04 1,7758e-01
PrintToLog[2] : 195 5411,37011 kJ/mol 1,3734e+03 4,5965e-04 8,6459e-02
PrintToLog[3] : 200 5410,12781 kJ/mol 8,6158e+02 1,3474e-03 9,4705e-01
PrintToLog[0] : 205 5409,20811 kJ/mol 8,4732e+01 2,6825e-04 1,2048e-02
PrintToLog[1] : 210 5409,19175 kJ/mol 9,1252e+00 3,1062e-05 1,9616e-04
PrintToLog[2] : 215 5409,19166 kJ/mol 8,3079e-02 2,5727e-07 2,2717e-08
PrintToLog[3] : 220 5409,19166 kJ/mol 3,0708e-03 1,4805e-08 3,0923e-11
PrintToLog[0] : the grad termination test was passed.
The application 'xfdesktop' lost its connection to the display :0.0;
most likely the X server was shut down or you killed/destroyed
the application.
zsh: exit 1 xfdesktop