diff --git a/plugins/UM3NetworkPrinting/NetworkPrinterOutputDevice.py b/plugins/UM3NetworkPrinting/NetworkPrinterOutputDevice.py
index 58b62217f0..af2e1f8c00 100755
--- a/plugins/UM3NetworkPrinting/NetworkPrinterOutputDevice.py
+++ b/plugins/UM3NetworkPrinting/NetworkPrinterOutputDevice.py
@@ -527,12 +527,12 @@ class NetworkPrinterOutputDevice(PrinterOutputDevice):
         self._last_request_time = time()
 
     def _finalizePostReply(self):
-        if self._post_reply is None:
-            return
-
         # Indicate uploading was finished (so another file can be send)
         self._write_finished = True
 
+        if self._post_reply is None:
+            return
+
         try:
             try:
                 self._post_reply.uploadProgress.disconnect(self._onUploadProgress)