diff --git a/packages/forest_admin_datasource_zendesk/lib/forest_admin_datasource_zendesk/collections/base_collection.rb b/packages/forest_admin_datasource_zendesk/lib/forest_admin_datasource_zendesk/collections/base_collection.rb
index a9aac3202..398a892e0 100644
--- a/packages/forest_admin_datasource_zendesk/lib/forest_admin_datasource_zendesk/collections/base_collection.rb
+++ b/packages/forest_admin_datasource_zendesk/lib/forest_admin_datasource_zendesk/collections/base_collection.rb
@@ -45,15 +45,24 @@ def aggregate_count(_caller, _filter)
 
       # Zendesk Search has no `id:` operator, so collections short-circuit
       # PK lookups to /resource/{id} when the filter is `id = N` or `id IN [...]`.
+      #
+      # The agent parses Number values through `to_f`, so an `id IN [...]` filter
+      # arrives as floats (e.g. `123.0`). Zendesk's REST ids are integers, so the
+      # values are normalised here before hitting /show_many or /resource/{id};
+      # otherwise the API rejects `123.0` (500) or the id-keyed result map misses.
       def extract_id_lookup(node)
         return nil unless node.is_a?(Leaf) && node.field == 'id'
 
         case node.operator
-        when Operators::EQUAL then [node.value]
-        when Operators::IN    then Array(node.value)
+        when Operators::EQUAL then [normalize_id(node.value)]
+        when Operators::IN    then Array(node.value).map { |v| normalize_id(v) }
         end
       end
 
+      def normalize_id(value)
+        Integer(value, exception: false) || value
+      end
+
       def project(record, projection)
         return record if projection.nil?
 
diff --git a/packages/forest_admin_datasource_zendesk/spec/forest_admin_datasource_zendesk/collections/ticket_spec.rb b/packages/forest_admin_datasource_zendesk/spec/forest_admin_datasource_zendesk/collections/ticket_spec.rb
index 3d7ff9e06..251f07e34 100644
--- a/packages/forest_admin_datasource_zendesk/spec/forest_admin_datasource_zendesk/collections/ticket_spec.rb
+++ b/packages/forest_admin_datasource_zendesk/spec/forest_admin_datasource_zendesk/collections/ticket_spec.rb
@@ -86,6 +86,24 @@ def zendesk_record(attrs)
           expect(client).to have_received(:fetch_tickets_by_ids).with([1, 2]).once
         end
 
+        it 'coerces float ids (as produced by the agent parser) to integers' do
+          bulk_response = { 1 => { 'id' => 1, 'requester_id' => nil } }
+          allow(client).to receive_messages(fetch_tickets_by_ids: bulk_response, fetch_user_emails: {})
+
+          filter = Filter.new(condition_tree: Leaf.new('id', 'in', [1.0, 2.0]))
+          expect(collection.list(nil, filter, ['id']).map { |r| r['id'] }).to eq([1])
+          expect(client).to have_received(:fetch_tickets_by_ids).with([1, 2])
+        end
+
+        it 'coerces a float id on an EQUAL lookup to an integer' do
+          ticket = { 'id' => 215, 'requester_id' => nil }
+          allow(client).to receive_messages(fetch_tickets_by_ids: { 215 => ticket }, fetch_user_emails: {})
+
+          filter = Filter.new(condition_tree: Leaf.new('id', 'equal', 215.0))
+          expect(collection.list(nil, filter, ['id']).map { |r| r['id'] }).to eq([215])
+          expect(client).to have_received(:fetch_tickets_by_ids).with([215])
+        end
+
         it 'silently drops ids the bulk endpoint did not return' do
           allow(client).to receive(:fetch_tickets_by_ids).with([1, 2]).and_return(
             1 => { 'id' => 1, 'requester_id' => nil }
diff --git a/packages/forest_admin_datasource_zendesk/spec/forest_admin_datasource_zendesk/collections/user_spec.rb b/packages/forest_admin_datasource_zendesk/spec/forest_admin_datasource_zendesk/collections/user_spec.rb
index 24f1f7fe3..bcf0a325d 100644
--- a/packages/forest_admin_datasource_zendesk/spec/forest_admin_datasource_zendesk/collections/user_spec.rb
+++ b/packages/forest_admin_datasource_zendesk/spec/forest_admin_datasource_zendesk/collections/user_spec.rb
@@ -38,6 +38,16 @@ def zendesk_user(attrs)
         expect(client).not_to have_received(:search)
       end
 
+      it 'coerces a float id (as produced by the agent parser) to an integer' do
+        user = zendesk_user('id' => 7, 'email' => 'a@b.com', 'name' => 'A')
+        allow(client).to receive_messages(find_user: user, search: [])
+
+        filter = Filter.new(condition_tree: Leaf.new('id', 'equal', 7.0))
+        collection.list(nil, filter, ['id', 'email'])
+        expect(client).to have_received(:find_user).with(7)
+        expect(client).not_to have_received(:search)
+      end
+
       it 'searches with type:user otherwise' do
         allow(client).to receive(:search).and_return([])