diff --git a/src/NetscriptWorker.ts b/src/NetscriptWorker.ts
index dfcb1245a..9e3284d72 100644
--- a/src/NetscriptWorker.ts
+++ b/src/NetscriptWorker.ts
@@ -638,8 +638,15 @@ export function loadAllRunningScripts(player: IPlayer): void {
       server.runningScripts.length = 0;
     } else {
       for (let j = 0; j < server.runningScripts.length; ++j) {
+        const fileName = server.runningScripts[j].filename;
         createAndAddWorkerScript(player, server.runningScripts[j], server);
 
+        if (!server.runningScripts[j]) {
+          // createAndAddWorkerScript can modify the server.runningScripts array if a script is invalid
+          console.error(`createAndAddWorkerScript removed ${fileName} from ${server}`);
+          continue;
+        }
+
         // Offline production
         scriptCalculateOfflineProduction(server.runningScripts[j]);
       }