diff --git a/src/update.ts b/src/update.ts
index 437e8a1..055a3f0 100644
--- a/src/update.ts
+++ b/src/update.ts
@@ -30,6 +30,9 @@ export default function update(timestamp: number) {
                 if (V.resources[resource] > storage[resource]) {
                     V.resources[resource] = storage[resource];
                 }
+                else if (V.resources[resource] < 0) {
+                    V.resources[resource] = 0;
+                }
             });
 
             return V;