diff --git a/recommendations/optimiser/funding_optimiser.py b/recommendations/optimiser/funding_optimiser.py
index 80ba02fd..787af8e0 100644
--- a/recommendations/optimiser/funding_optimiser.py
+++ b/recommendations/optimiser/funding_optimiser.py
@@ -714,7 +714,9 @@ def optimise_with_scenarios(
                 remaining_measures.append(kept)
 
         remaining_budget = budget - fabric_cost if budget is not None else None
-        remaining_budget = 0 if remaining_budget < 0 else remaining_budget
+
+        if remaining_budget is not None:
+            remaining_budget = 0 if remaining_budget < 0 else remaining_budget
 
         picked_extra, extra_cost, extra_gain = run_optimizer(
             remaining_measures,