diff --git a/src/app/services/python-uploader/mip/PackageManager.ts b/src/app/services/python-uploader/mip/PackageManager.ts
index 7c60c85f..7294b9b7 100644
--- a/src/app/services/python-uploader/mip/PackageManager.ts
+++ b/src/app/services/python-uploader/mip/PackageManager.ts
@@ -51,11 +51,13 @@ export class PackageManager {
         if (!url) {
             throw new Error('No url provided');
         } else if (url.startsWith('github:')) {
-            const writer = this.serialPort.writable.getWriter();
-            const reader = this.serialPort.readable.getReader();
+            let writer = this.serialPort.writable.getWriter();
+            let reader = this.serialPort.readable.getReader();
             try {
                 await mkdir(writer, reader, '/lib');
             } catch (error) {}
+            writer.releaseLock();
+            reader.releaseLock();
             let json = JSON.parse(await PackageManager.fetchMipUrl(url));
             const version = json['version'];
             if (await this.checkLibraryVersion(version, PackageManager.getLibraryName(url))) {
@@ -69,6 +71,8 @@ export class PackageManager {
                 content.push({name: '/lib/' + file[0], content: response});
             }
 
+            writer = this.serialPort.writable.getWriter();
+            reader = this.serialPort.readable.getReader();
             // get a list of .dist-info files in the lib folder and delete them
             const response = await ls(writer, reader, '/lib');
             // get a list of all the .dist-info folders