diff --git a/src/download/download-engine/download-file/download-engine-file.ts b/src/download/download-engine/download-file/download-engine-file.ts
index 08f213e..99f0264 100644
--- a/src/download/download-engine/download-file/download-engine-file.ts
+++ b/src/download/download-engine/download-file/download-engine-file.ts
@@ -125,7 +125,7 @@ export default class DownloadEngineFile extends EventEmitter<DownloadEngineFileE
 
     protected _emptyChunksForPart(part: number) {
         const partInfo = this.file.parts[part];
-        if (!partInfo.acceptRange) {
+        if (partInfo.size === 0) {
             return [ChunkStatus.NOT_STARTED];
         }
 
diff --git a/src/download/download-engine/streams/download-engine-fetch-stream/download-engine-fetch-stream-fetch.ts b/src/download/download-engine/streams/download-engine-fetch-stream/download-engine-fetch-stream-fetch.ts
index 170035d..fa6ca30 100644
--- a/src/download/download-engine/streams/download-engine-fetch-stream/download-engine-fetch-stream-fetch.ts
+++ b/src/download/download-engine/streams/download-engine-fetch-stream/download-engine-fetch-stream-fetch.ts
@@ -65,7 +65,7 @@ export default class DownloadEngineFetchStreamFetch extends BaseDownloadEngineFe
         const acceptRange = this.options.acceptRangeIsKnown ?? response.headers.get("accept-ranges") === "bytes";
         const fileName = parseContentDisposition(response.headers.get("content-disposition"));
 
-        let length = parseInt(response.headers.get("content-length")!);
+        let length = parseInt(response.headers.get("content-length")!) || 0;
         if (response.headers.get("content-encoding") || browserCheck() && MIN_LENGTH_FOR_MORE_INFO_REQUEST < length) {
             length = acceptRange ? await this.fetchDownloadInfoWithoutRetryContentRange(url) : 0;
         }