--- a/eric6/E5Gui/E5ProcessDialog.py	Sat Apr 10 17:54:58 2021 +0200
+++ b/eric6/E5Gui/E5ProcessDialog.py	Sat Apr 10 18:31:17 2021 +0200
@@ -237,7 +237,7 @@
                     progress = int(match.group(1))
                     self.progressBar.setValue(progress)
                     if not s.endswith("\n"):
-                        s = s + "\n"
+                        s += "\n"
             self.resultbox.insertPlainText(s)
             self.resultbox.ensureCursorVisible()