diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9388bdd..cdc4237 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,10 @@
 # Changelog
 
+1.9.5
+
+- added: `Check file` also check if GP modifiers have broken layer target
+- changed: `Check file` disable drawing guide is now On by default
+
 1.9.4
 
 - feat: renaming using the name_manager take care of changing layer target values in GP modifiers
diff --git a/OP_file_checker.py b/OP_file_checker.py
index b1d72cf..3c2f5e2 100755
--- a/OP_file_checker.py
+++ b/OP_file_checker.py
@@ -9,8 +9,8 @@ class GPTB_OT_file_checker(bpy.types.Operator):
     bl_description = "Check / correct some aspect of the file, properties and such and report"
     bl_options = {"REGISTER"}
     
-    ## list of action : 
-    # Lock main cam:
+    ## list of actions : 
+    # Lock main cam
     # set scene res
     # set scene percentage at 100:
     # set show slider and sync range
@@ -21,6 +21,7 @@ class GPTB_OT_file_checker(bpy.types.Operator):
     # Disabled animation
     # Object visibility conflict
     # GP modifiers visibility conflict
+    # GP modifiers broken target check
     # Set onion skin filter to 'All type'
     # Set filepath type
     # Set Lock object mode state
@@ -167,6 +168,17 @@ class GPTB_OT_file_checker(bpy.types.Operator):
                 ## warn only : problems.append(f'{mod_viz_ct} visibility conflicts in Gp object modifiers (details in console)')
                 problems.append(['gp.list_modifier_visibility', f'{mod_viz_ct} visibility conflicts in Gp object modifiers (details in console)', 'MODIFIER_DATA'])
 
+        ## check if GP modifier have broken layer targets
+        if fix.list_broken_mod_targets:
+            for o in [o for o in bpy.context.scene.objects if o.type == 'GPENCIL']:
+                lay_name_list = [l.info for l in o.data.layers]
+                for m in o.grease_pencil_modifiers:
+                    if not hasattr(m, 'layer'):
+                        continue
+                    if not m.layer in lay_name_list:
+                        mess = f'Broken modifier target: {o.name} > {m.name} > {m.layer}'
+                        print(mess)
+                        problems.append(mess)
 
         ## Use median point
         if fix.set_pivot_median_point:
@@ -217,7 +229,6 @@ class GPTB_OT_file_checker(bpy.types.Operator):
                     if apply:
                         bpy.context.scene.tool_settings.lock_object_mode = False
 
-
         # ## Set onion skin filter to 'All type'
         # fix_kf_type = 0 
         # for gp in bpy.data.grease_pencils:#from data
diff --git a/__init__.py b/__init__.py
index d98c894..b34d8d5 100755
--- a/__init__.py
+++ b/__init__.py
@@ -15,7 +15,7 @@ bl_info = {
 "name": "GP toolbox",
 "description": "Tool set for Grease Pencil in animation production",
 "author": "Samuel Bernou, Christophe Seux",
-"version": (1, 9, 4),
+"version": (1, 9, 5),
 "blender": (2, 91, 0),
 "location": "Sidebar (N menu) > Gpencil > Toolbox / Gpencil properties",
 "warning": "",
@@ -606,6 +606,7 @@ class GPTB_prefs(bpy.types.AddonPreferences):
             col.prop(self.fixprops, 'list_disabled_anim')
             col.prop(self.fixprops, 'list_obj_vis_conflict')
             col.prop(self.fixprops, 'list_gp_mod_vis_conflict')
+            col.prop(self.fixprops, 'list_broken_mod_targets')
             col.prop(self.fixprops, 'autokey_add_n_replace')
             #-# col.prop(self.fixprops, 'set_cursor_type')
             col.prop(self.fixprops, "select_active_tool", icon='RESTRICT_SELECT_OFF')
diff --git a/properties.py b/properties.py
index 7784dfc..70b2080 100755
--- a/properties.py
+++ b/properties.py
@@ -83,7 +83,7 @@ class GP_PG_FixSettings(bpy.types.PropertyGroup):
     disable_guide : BoolProperty(
         name="Disable Drawing Guide",
         description="Disable constrained guide in draw mode", 
-        default=False, options={'HIDDEN'})
+        default=True, options={'HIDDEN'})
 
     list_disabled_anim : BoolProperty(
         name="List Disabled Animation",
@@ -100,6 +100,11 @@ class GP_PG_FixSettings(bpy.types.PropertyGroup):
         description="Alert if some GP modifier have different show viewport and show render values", 
         default=True, options={'HIDDEN'})
 
+    list_broken_mod_targets : BoolProperty(
+        name="List GP Object modifiers broken target",
+        description="Alert if some GP modifier have a target layer not existing in layer stack", 
+        default=True, options={'HIDDEN'})
+
     autokey_add_n_replace : BoolProperty(
         name="Autokey Mode Add and Replace",
         description="Change autokey mode back to 'Add & Replace'",