diff --git a/src/collective/task/profiles/default/workflows/basic_task_workflow/definition.xml b/src/collective/task/profiles/default/workflows/basic_task_workflow/definition.xml
index 7e80daf..6698af7 100644
--- a/src/collective/task/profiles/default/workflows/basic_task_workflow/definition.xml
+++ b/src/collective/task/profiles/default/workflows/basic_task_workflow/definition.xml
@@ -22,6 +22,7 @@
  </state>
  <state state_id="todo" title="To do" i18n:attributes="title">
   <exit-transition transition_id="mark-as-done"/>
+  <exit-transition transition_id="abandon"/>
   <permission-map name="View" acquired="False" i18n:attributes="title">
    <permission-role>Editor</permission-role>
    <permission-role>Manager</permission-role>
@@ -34,10 +35,28 @@
    <permission-role>Reviewer</permission-role>
   </permission-map>
  </state>
+ <state state_id="abandoned" title="Abandoned" i18n:attributes="title">
+  <permission-map name="View" acquired="False">
+   <permission-role>Manager</permission-role>
+   <permission-role>Reviewer</permission-role>
+   <permission-role>Editor</permission-role>
+   <permission-role>Reader</permission-role>
+  </permission-map>
+  <permission-map name="Modify portal content" acquired="False">
+   <permission-role>Manager</permission-role>
+  </permission-map>
+ </state>
+
  <transition transition_id="mark-as-done" title="Mark as done" new_state="done" trigger="USER" before_script="" after_script="">
   <action url="" category="workflow" icon="" i18n:translate="">Mark as done</action>
   <guard>
     <guard-role>Editor</guard-role>
   </guard>
  </transition>
+<transition transition_id="abandon" title="Abandon" new_state="abandoned" trigger="USER" before_script="" after_script="">
+  <action url="" category="workflow" icon="" i18n:translate="">Abandon</action>
+  <guard>
+   <guard-role>Manager</guard-role>
+  </guard>
+ </transition>
 </dc-workflow>
diff --git a/src/collective/task/profiles/default/workflows/validation_workflow/definition.xml b/src/collective/task/profiles/default/workflows/validation_workflow/definition.xml
index 34587eb..8088b8d 100644
--- a/src/collective/task/profiles/default/workflows/validation_workflow/definition.xml
+++ b/src/collective/task/profiles/default/workflows/validation_workflow/definition.xml
@@ -34,6 +34,7 @@
  <state state_id="todo" title="To do" i18n:attributes="title">
   <exit-transition transition_id="validate"/>
   <exit-transition transition_id="refuse"/>
+  <exit-transition transition_id="abandon"/>
   <permission-map name="View" acquired="False" i18n:attributes="title">
    <permission-role>Editor</permission-role>
    <permission-role>Manager</permission-role>
@@ -46,6 +47,19 @@
    <permission-role>Reviewer</permission-role>
   </permission-map>
  </state>
+ <state state_id="abandoned" title="Abandoned" i18n:attributes="title">
+  <permission-map name="View" acquired="False">
+   <permission-role>Manager</permission-role>
+   <permission-role>Reviewer</permission-role>
+   <permission-role>Editor</permission-role>
+   <permission-role>Reader</permission-role>
+  </permission-map>
+  <permission-map name="Modify portal content" acquired="False">
+   <permission-role>Manager</permission-role>
+  </permission-map>
+ </state>
+
+
  <transition transition_id="validate" title="Validate" new_state="validated" trigger="USER" before_script="" after_script="">
   <action url="" category="workflow" icon="" i18n:translate="">Validate</action>
   <guard>
@@ -58,4 +72,11 @@
     <guard-role>Editor</guard-role>
   </guard>
  </transition>
+<transition transition_id="abandon" title="Abandon" new_state="abandoned" trigger="USER" before_script="" after_script="">
+  <action url="" category="workflow" icon="" i18n:translate="">Abandon</action>
+  <guard>
+   <guard-role>Manager</guard-role>
+  </guard>
+ </transition>
+
 </dc-workflow>
diff --git a/src/collective/task/subscribers.py b/src/collective/task/subscribers.py
index 230f6f2..6325a46 100644
--- a/src/collective/task/subscribers.py
+++ b/src/collective/task/subscribers.py
@@ -41,11 +41,17 @@ def task_changed_state(context, event):
         with api.env.adopt_roles(['Reviewer']):
             if event.new_state.id == 'done':
                 with api.env.adopt_user('admin'):
-                    api.content.transition(obj=parent, transition='subtask-done')
+                    try:
+                        api.content.transition(obj=parent, transition='subtask-done')
+                    except api.exc.InvalidParameterError:
+                        pass
                 parent.reindexObject(idxs=['review_state'])
             elif event.new_state.id == 'abandoned':
                 with api.env.adopt_user('admin'):
-                    api.content.transition(obj=parent, transition='subtask-abandoned')
+                    try:
+                        api.content.transition(obj=parent, transition='subtask-abandoned')
+                    except api.exc.InvalidParameterError:
+                        pass
                 parent.reindexObject(idxs=['review_state'])