diff --git a/web/app.js b/web/app.js
index 096f74a..cfe9f78 100644
--- a/web/app.js
+++ b/web/app.js
@@ -158,6 +158,8 @@ class SerialPortHandler {
       } catch (error) {
         console.error(error);
         throw error;
+      } finally {
+        reader.releaseLock();
       }
     }
   }