diff --git a/web/src/lib/queen-bee/queue.ts b/web/src/lib/queen-bee/queue.ts
index 3e7b1db8..f7550348 100644
--- a/web/src/lib/queen-bee/queue.ts
+++ b/web/src/lib/queen-bee/queue.ts
@@ -95,6 +95,7 @@ export const createSavePipeline = (info: CobaltLocalProcessingResponse, request:
             workerId: crypto.randomUUID(),
             parentId,
             workerArgs: {
+                files: [],
                 ffargs,
                 output: {
                     type: info.output.type,
diff --git a/web/src/lib/queen-bee/run-worker.ts b/web/src/lib/queen-bee/run-worker.ts
index b78fbd79..ef20e618 100644
--- a/web/src/lib/queen-bee/run-worker.ts
+++ b/web/src/lib/queen-bee/run-worker.ts
@@ -18,11 +18,11 @@ export const startWorker = async ({ worker, workerId, parentId, workerArgs }: Co
 
     switch (worker) {
         case "remux":
-            if (workerArgs?.files) {
+            if (workerArgs.files) {
                 files = workerArgs.files;
             }
 
-            if (files?.length === 0) {
+            if (files.length === 0) {
                 const parent = get(queue)[parentId];
                 if (parent.state === "running" && parent.pipelineResults.length) {
                     files = parent.pipelineResults;
@@ -42,9 +42,7 @@ export const startWorker = async ({ worker, workerId, parentId, workerArgs }: Co
             break;
 
         case "fetch":
-            if (workerArgs?.url) {
-                await runFetchWorker(workerId, parentId, workerArgs.url)
-            }
+            await runFetchWorker(workerId, parentId, workerArgs.url)
             break;
     }
 }
diff --git a/web/src/lib/types/workers.ts b/web/src/lib/types/workers.ts
index fdb8d341..c69c95fe 100644
--- a/web/src/lib/types/workers.ts
+++ b/web/src/lib/types/workers.ts
@@ -12,16 +12,28 @@ export type CobaltWorkerProgress = {
     size: number,
 }
 
-export type CobaltWorkerArgs = {
-    files?: CobaltFileReference[],
-    url?: string,
-    ffargs?: string[],
-    output?: FileInfo,
+export type CobaltFetchWorkerArgs = { url: string };
+
+export type CobaltRemuxWorkerArgs = {
+    files: CobaltFileReference[],
+    ffargs: string[],
+    output: FileInfo,
 }
 
-export type CobaltPipelineItem = {
+export type CobaltPipelineItemBase = {
     worker: CobaltWorkerType,
     workerId: string,
     parentId: string,
-    workerArgs: CobaltWorkerArgs,
+};
+
+type CobaltRemuxPipelineItem = CobaltPipelineItemBase & {
+    worker: "remux",
+    workerArgs: CobaltRemuxWorkerArgs,
 }
+
+type CobaltFetchPipelineItem = CobaltPipelineItemBase & {
+    worker: "fetch",
+    workerArgs: CobaltFetchWorkerArgs,
+}
+
+export type CobaltPipelineItem = CobaltRemuxPipelineItem | CobaltFetchPipelineItem;