Description of problem:
I was trying to figure out how to share one Material instance after re-combining four duplicated meshes into one (I want them all to hve the same texture anyway).

Version-Release number of selected component:
1:blender-2.83.5-5.fc32

Additional info:
reporter:       libreport-2.13.1
cgroup:         0::/user.slice/user-1000.slice/session-2.scope
cmdline:        /usr/bin/blender
crash_function: draw
exception_type: AttributeError
executable:     /usr/bin/blender
interpreter:    blender-2.83.5-5.fc32.x86_64
kernel:         5.8.11-200.fc32.x86_64
runlevel:       N 5
type:           Python3
uid:            1000

Truncated backtrace:
properties_grease_pencil_common.py:632:draw:AttributeError: 'Mesh' object has no attribute 'use_stroke_edit_mode'

Traceback (most recent call last):
  File "/usr/share/blender/2.83/scripts/startup/bl_ui/properties_grease_pencil_common.py", line 632, in draw
    if ob.data.use_stroke_edit_mode:
AttributeError: 'Mesh' object has no attribute 'use_stroke_edit_mode'

Local variables in innermost frame:
self: bpy.data.screens['Modeling']...MATERIAL_PT_gpencil_slots
context: <bpy_struct, Context at 0x7f3e7e4e1908>
layout: bpy.data.screens['Modeling']...UILayout
show_full_ui: True
is_view3d: False
tool_settings: bpy.data.scenes['Scene'].tool_settings
gpencil_paint: bpy.data.scenes['Scene'].tool_settings.gpencil_paint
brush: bpy.data.brushes['Pencil']
ob: bpy.data.objects['Bezel']
row: bpy.data.screens['Modeling']...UILayout
is_sortable: True
rows: 7
col: bpy.data.screens['Modeling']...UILayout
sub: bpy.data.screens['Modeling']...UILayout
slot: bpy.data.objects['Bezel'].material_slots[0]
icon_link: 'MESH_DATA'