diff --git a/src/main/angular/src/app/editor/circuit/Calculation.ts b/src/main/angular/src/app/editor/circuit/Calculation.ts
index 618ce75..cb22976 100644
--- a/src/main/angular/src/app/editor/circuit/Calculation.ts
+++ b/src/main/angular/src/app/editor/circuit/Calculation.ts
@@ -147,7 +147,7 @@ export class Calculation {
           const newPart = !foundParts.includes(destinationPart);
           if (newPart) {
             foundParts.push(destinationPart);
-            restParts.splice(restParts.indexOf(battery), 1);
+            restParts.splice(restParts.indexOf(destinationPart), 1);
           }
           todo.push(destinationJunction);
           foundJunctions.push(destinationJunction);