diff --git a/app/controllers/checklist/timelines_controller.rb b/app/controllers/checklist/timelines_controller.rb
index 8ba7c28e4b..a09306ce9e 100644
--- a/app/controllers/checklist/timelines_controller.rb
+++ b/app/controllers/checklist/timelines_controller.rb
@@ -2,6 +2,7 @@ class Checklist::TimelinesController < ApplicationController
 
   def index
     return render :json => []  if params[:taxon_concept_ids].nil?
+    return render :json => []  unless params[:taxon_concept_ids].kind_of?(Array)
     res = params[:taxon_concept_ids].map do |tc_id|
       tc = MTaxonConcept.find_by_id(tc_id)
       Checklist::TimelinesForTaxonConcept.new(tc) unless tc.nil?
diff --git a/app/models/checklist/timeline_event.rb b/app/models/checklist/timeline_event.rb
index 8fca3911d6..28eb17980c 100644
--- a/app/models/checklist/timeline_event.rb
+++ b/app/models/checklist/timeline_event.rb
@@ -15,7 +15,14 @@ class Checklist::TimelineEvent
   #:hash_ann_parent_symbol e.g. CoP15
   #:pos - position (%)
   def initialize(options)
-    @id = (options[:taxon_concept_id] << 8) + options[:id]
+    # if it is an auto-inserted deletion it won't have an id
+    id = options[:id] || (
+      (options[:species_listing_id] << 16) +
+      (options[:change_type_id] << 12) +
+      (options[:effective_at].to_i << 8) +
+      (options[:party_id] || 0)
+    )
+    @id = (options[:taxon_concept_id] << 8) + id
     @pos = options[:pos]
     @party_id = options[:party_id]
     @change_type_name = options[:change_type_name]
diff --git a/app/models/m_listing_change.rb b/app/models/m_listing_change.rb
index 9fcb208c8a..2425fc118d 100644
--- a/app/models/m_listing_change.rb
+++ b/app/models/m_listing_change.rb
@@ -48,7 +48,8 @@ def to_timeline_event
     Checklist::TimelineEvent.new(
       self.as_json(
         :only => [
-          :id, :taxon_concept_id, :change_type_name, :species_listing_name, :party_id,
+          :id, :taxon_concept_id, :change_type_id, :change_type_name,
+          :species_listing_id, :species_listing_name, :party_id,
           :is_current, :hash_ann_symbol, :hash_ann_parent_symbol,
           :effective_at, :auto_note, :inclusion_taxon_concept_id
         ],
diff --git a/spec/models/checklist/timeline_spec.rb b/spec/models/checklist/timeline_spec.rb
index f5f249c4c0..5349ee5bd7 100644
--- a/spec/models/checklist/timeline_spec.rb
+++ b/spec/models/checklist/timeline_spec.rb
@@ -232,4 +232,33 @@
     specify{ subject.timeline_intervals[1].end_pos.should == 1 }
   end
 
+  context "when automatic deletion from ancestor listing" do
+    let(:tc){
+      genus = create_cites_eu_genus
+      tc = create_cites_eu_species(parent: genus)
+      create_cites_I_addition(
+        :taxon_concept => genus,
+        :effective_at => '1975-06-06',
+        :is_current => true
+      )
+      create_cites_II_addition(
+        :taxon_concept => tc,
+        :effective_at => '1976-06-08',
+        :is_current => true
+      )
+      # tc should have a cascaded ADD I from parent and an auto DEL I
+      Sapi::StoredProcedures.rebuild_cites_taxonomy_and_listings
+      MTaxonConcept.find(tc.id)
+    }
+    let(:ttc){ Checklist::TimelinesForTaxonConcept.new(tc)}
+    let(:subject){ ttc.timelines.first }
+
+    specify{
+      subject.timeline_events.map(&:change_type_name).should ==
+        ['ADDITION', 'DELETION']
+    }
+    specify{ subject.timeline_intervals.count.should == 1 }
+    specify{ subject.timeline_intervals[0].end_pos.should == subject.timeline_events[1].pos }
+  end
+
 end