diff --git a/src/assets/ITThermal.js b/src/assets/ITThermal.js
index 8479eca..d221aa2 100644
--- a/src/assets/ITThermal.js
+++ b/src/assets/ITThermal.js
@@ -1,7 +1,7 @@
 /* ITS Thermal Receipt Printer
  * Developed by Skylar Grant for MCCS ITS
  */
-const version = "1.2.5";
+const version = "1.2.6";
 // #############################################################
 // Variables
 // #############################################################
@@ -128,6 +128,14 @@ function deviceTrackerHandler() {
         alert('Please fill out all required fields (Ticket Number, User, Service Type).');
         return;
     }
+    const dtTicketNumber = Number.parseInt(dtticket);
+    if (!(Number.isInteger(dtTicketNumber) && dtTicketNumber > 0)) {
+        alert('Please enter a valid Ticket Number (positive integer).');
+        return;
+    } else if (dtTicketNumber > 999999) {
+        alert('Please enter a valid Ticket Number (6 digits or less).');
+        return;
+    }
 
     // Generate the line array and PDF
     const lineArray = prepDeviceTracker(dtticket, dtuser, dtservice, dtnotes);