diff --git a/src/octoprint/util/comm.py b/src/octoprint/util/comm.py
index 9fddd6b5..6bea89a9 100644
--- a/src/octoprint/util/comm.py
+++ b/src/octoprint/util/comm.py
@@ -665,6 +665,10 @@ class MachineCom(object):
 		if not self.isOperational() or self.isStreaming():
 			return
 
+		if not self.isBusy() or self._currentFile is None:
+			# we aren't even printing, nothing to cancel...
+			return
+
 		self._changeState(self.STATE_OPERATIONAL)
 
 		if self.isSdFileSelected():