diff --git a/src/octoprint/plugins/virtual_printer/virtual.py b/src/octoprint/plugins/virtual_printer/virtual.py
index b9596ec4..59c3da46 100644
--- a/src/octoprint/plugins/virtual_printer/virtual.py
+++ b/src/octoprint/plugins/virtual_printer/virtual.py
@@ -298,7 +298,7 @@ class VirtualPrinter():
 		if not self._supportM112:
 			return
 		self._killed = True
-		self._send("echo:EMERGENCY SHUTDOWN DETECTED. KILLED.")
+		self.outgoing.put("echo:EMERGENCY SHUTDOWN DETECTED. KILLED.")
 
 	def _triggerResend(self, expected=None, actual=None):
 		with self._incoming_lock:
@@ -677,7 +677,6 @@ class VirtualPrinter():
 				return
 
 			if "M112" in data and self._supportM112:
-				self._seriallog.info("<<< {}".format(data.strip()))
 				self._kill()
 				return
 
@@ -704,6 +703,9 @@ class VirtualPrinter():
 		self.buffered = None
 
 	def _sendOk(self):
+		if self.outgoing is None:
+			return
+
 		if settings().getBoolean(["devel", "virtualPrinter", "okWithLinenumber"]):
 			self.outgoing.put("ok %d" % self.lastN)
 		else:
diff --git a/src/octoprint/util/comm.py b/src/octoprint/util/comm.py
index f0572439..49c8bc6c 100644
--- a/src/octoprint/util/comm.py
+++ b/src/octoprint/util/comm.py
@@ -1778,7 +1778,7 @@ class MachineCom(object):
 		# close to reset host state
 		self._errorValue = "Closing serial port due to emergency stop M112."
 		self._log(self._errorValue)
-		self.close(is_error=True)
+		self.close(isError=True)
 
 		# fire the M112 event since we sent it and we're going to prevent the caller from seeing it
 		gcode = "M112"