loop: avoid errors in close when port was not opened
diff --git a/serial/urlhandler/protocol_loop.py b/serial/urlhandler/protocol_loop.py
index d07081a..d9099de 100644
--- a/serial/urlhandler/protocol_loop.py
+++ b/serial/urlhandler/protocol_loop.py
@@ -47,6 +47,8 @@
def __init__(self, *args, **kwargs):
super(Serial, self).__init__(*args, **kwargs)
self.buffer_size = 4096
+ self.queue = None
+ self.logger = None
def open(self):
"""\
@@ -76,11 +78,12 @@
self.reset_output_buffer()
def close(self):
- self.is_open = False
- try:
- self.queue.put_nowait(None)
- except queue.Full:
- pass
+ if self.is_open:
+ self.is_open = False
+ try:
+ self.queue.put_nowait(None)
+ except queue.Full:
+ pass
super(Serial, self).close()
def _reconfigure_port(self):