diff --git a/src/data/projEntry.tsx b/src/data/projEntry.tsx
index 0ce7ca9..fc02dbc 100644
--- a/src/data/projEntry.tsx
+++ b/src/data/projEntry.tsx
@@ -870,9 +870,12 @@ export const main = createLayer("main", function (this: BaseLayer) {
         if (Decimal.lt(energy.value, 0)) {
             // Uh oh, time to de-power machines!
             energy.value = 0;
-            poweredMachines.forEach(machine => {
-                (machine.value?.state as { powered: boolean }).powered = false;
-            });
+            poweredMachines
+                .map(m => m.value)
+                .filter(machine => machine != null)
+                .forEach(machine => {
+                    (machine?.state as { powered: boolean }).powered = false;
+                });
             Object.values(portalNodes.value).forEach(portal => {
                 (portal.state as { powered: boolean }).powered = false;
             });