diff --git a/print-server.js b/print-server.js
index 0bfff6b..261e13d 100644
--- a/print-server.js
+++ b/print-server.js
@@ -86,7 +86,10 @@ class PrintServer {
         try {
             await conn.beginTransaction();
             [[printJob]] = await conn.query(selectQuery, ['LabelCollection', this.conf.printers]);
-            if (!printJob) return;
+            if (!printJob) {
+                conn.rollback();
+                return;
+            }
 
             jobId = printJob.id;
             this.method = printJob.method;