diff --git a/pyrs/interface/ui/diffdataviews.py b/pyrs/interface/ui/diffdataviews.py
index 51bed4acc..6ada694b7 100644
--- a/pyrs/interface/ui/diffdataviews.py
+++ b/pyrs/interface/ui/diffdataviews.py
@@ -45,8 +45,9 @@ def plot_pole_figure(self, vec_alpha, vec_beta, vec_intensity):
         # else:
         # plot contour
         # TODO - make the grid of r converted from linear grid on alpha
+        init_value = np.nan   # np.nan
         self._myCanvas.plot_contour(vec_theta=vec_beta, vec_r=vec_r, vec_values=vec_intensity, max_r=90.,
-                                    r_resolution=5., theta_resolution=5., init_value=np.nan)
+                                    r_resolution=5., theta_resolution=5., init_value=init_value)
 
         # TODO - convert (vec_r, vec_beta) to X, Y and do a scattering in another
 
diff --git a/pyrs/interface/ui/mplgraphicsviewpolar.py b/pyrs/interface/ui/mplgraphicsviewpolar.py
index 57d176837..24cb8375c 100644
--- a/pyrs/interface/ui/mplgraphicsviewpolar.py
+++ b/pyrs/interface/ui/mplgraphicsviewpolar.py
@@ -191,7 +191,10 @@ def plot_contour(self, vec_theta, vec_r, vec_values, max_r, r_resolution, theta_
             # END-IF-ELSE
 
             # set value
-            mesh_values[index_theta, index_r] += value_i
+            if np.isnan(mesh_values[index_theta, index_r]):
+                mesh_values[index_theta, index_r] = value_i
+            else:
+                mesh_values[index_theta, index_r] += value_i
         # END-FOR
 
         # plot