fix for python error

release/scripts/ui/properties_data_armature.py

@@ -250,13 +250,14 @@ class DATA_PT_iksolver_itasc(DataButtonsPanel):
         ob = context.object
 
         itasc = ob.pose.ik_param
-        wide_ui = context.region.width > narrowui
+        wide_ui = (context.region.width > narrowui)
 
         row = layout.row()
         row.prop(ob.pose, "ik_solver")
         
+        if itasc:
             layout.prop(itasc, "mode", expand=True)
-        simulation = itasc.mode == 'SIMULATION'
+            simulation = (itasc.mode == 'SIMULATION')
             if simulation:
                 layout.label(text="Reiteration:")
                 layout.prop(itasc, "reiteration", expand=True)