diff --git a/tools/idf_monitor_base/serial_handler.py b/tools/idf_monitor_base/serial_handler.py
old mode 100644
new mode 100755
index b3a71f64a2..394dca021e
--- a/tools/idf_monitor_base/serial_handler.py
+++ b/tools/idf_monitor_base/serial_handler.py
@@ -88,13 +88,8 @@ class SerialHandler:
         if self._last_line_part != b'':
             # add unprocessed part from previous "data" to the first line
             sp[0] = self._last_line_part + sp[0]
-            self._last_line_part = b''
-        if sp[-1] != b'':
-            # last part is not a full line
-            self._last_line_part = sp.pop()
+        self._last_line_part = sp.pop()
         for line in sp:
-            if line == b'':
-                continue
             if self._serial_check_exit and line == console_parser.exit_key.encode('latin-1'):
                 raise SerialStopException()
             if gdb_helper: