diff --git a/packages/loot-core/src/server/budget/cleanup-template.ts b/packages/loot-core/src/server/budget/cleanup-template.ts
index 356546b207..fcd0cc8204 100644
--- a/packages/loot-core/src/server/budget/cleanup-template.ts
+++ b/packages/loot-core/src/server/budget/cleanup-template.ts
@@ -82,11 +82,9 @@ async function processCleanup(month) {
       `budget-${sinkCategory[c].cat.id}`,
     );
     let categoryId = sinkCategory[c].cat.id;
+    let weight = sinkCategory[c].temp.filter(w => w.type === 'sink')[0].weight;
     let to_budget =
-      budgeted +
-      Math.round(
-        (sinkCategory[c].temp[0].weight / total_weight) * budgetAvailable,
-      );
+      budgeted + Math.round((weight / total_weight) * budgetAvailable);
     if (c === sinkCategory.length - 1) {
       let currentBudgetAvailable = await getSheetValue(sheetName, `to-budget`);
       if (to_budget > currentBudgetAvailable) {
diff --git a/upcoming-release-notes/1084.md b/upcoming-release-notes/1084.md
new file mode 100644
index 0000000000..ab882f4b54
--- /dev/null
+++ b/upcoming-release-notes/1084.md
@@ -0,0 +1,6 @@
+---
+category: Bugfix
+authors: [shall0pass]
+---
+
+Fix error if sink/source were defined in same category.