diff --git a/db/schema.rb b/db/schema.rb
index e15b4f97..a8e6f270 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[7.0].define(version: 2023_06_05_101124) do
+ActiveRecord::Schema[7.1].define(version: 2023_06_05_101124) do
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
 
diff --git a/lib/sidekiq_scheduler_backoff_service.rb b/lib/sidekiq_scheduler_backoff_service.rb
index 6c864743..7d2d8b32 100644
--- a/lib/sidekiq_scheduler_backoff_service.rb
+++ b/lib/sidekiq_scheduler_backoff_service.rb
@@ -11,12 +11,16 @@ def record_success
     initial_interval = current_interval
     target_interval = [initial_interval - 1, min_interval].max
     restart_schedule(target_interval) if target_interval != initial_interval
+  rescue StandardError
+    notify_missing_schedule
   end
 
   def record_failure
     initial_interval = current_interval
     target_interval = [initial_interval * 2, max_interval].min
     restart_schedule(target_interval) if target_interval != initial_interval
+  rescue StandardError
+    notify_missing_schedule
   end
 
 private
@@ -30,4 +34,11 @@ def restart_schedule(target_interval)
     schedule = Sidekiq.get_schedule[name]
     Sidekiq.set_schedule(name, schedule.merge("every" => "#{target_interval}s"))
   end
+
+  def notify_missing_schedule
+    GovukError.notify(
+      "Queue schedule missing",
+      extra: { available_schedules: Sidekiq.get_schedule.keys },
+    )
+  end
 end
diff --git a/spec/lib/sidekiq_scheduler_backoff_service_spec.rb b/spec/lib/sidekiq_scheduler_backoff_service_spec.rb
index fa4a6c3c..e12cac84 100644
--- a/spec/lib/sidekiq_scheduler_backoff_service_spec.rb
+++ b/spec/lib/sidekiq_scheduler_backoff_service_spec.rb
@@ -50,6 +50,15 @@
         expect(scheduled_interval).to eq("#{max_interval}s")
       end
     end
+
+    context "when the schedule is missing" do
+      subject { SidekiqSchedulerBackoffService.new(name: "non-existing-queue", min_interval:, max_interval:) }
+
+      it "records the problem to GovukError" do
+        expect(GovukError).to receive(:notify)
+        subject.record_failure
+      end
+    end
   end
 
   describe "#record_success" do
@@ -96,6 +105,15 @@
         expect(scheduled_interval).to eq("#{max_interval}s")
       end
     end
+
+    context "when the schedule is missing" do
+      subject { SidekiqSchedulerBackoffService.new(name: "non-existing-queue", min_interval:, max_interval:) }
+
+      it "records the problem to GovukError" do
+        expect(GovukError).to receive(:notify)
+        subject.record_success
+      end
+    end
   end
 end