From 31641179f989b51469e61d770e25845aeedd9d1e Mon Sep 17 00:00:00 2001
From: David Robillard <d@drobilla.net>
Date: Sat, 27 Dec 2014 12:26:55 -0500
Subject: [PATCH] Fix potential pop of empty enter stack.

---
 gtk2_ardour/editor_mouse.cc | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/gtk2_ardour/editor_mouse.cc b/gtk2_ardour/editor_mouse.cc
index 6f22199d66..9edef8056e 100644
--- a/gtk2_ardour/editor_mouse.cc
+++ b/gtk2_ardour/editor_mouse.cc
@@ -1651,7 +1651,9 @@ Editor::leave_handler (ArdourCanvas::Item* item, GdkEvent*, ItemType item_type)
 	bool is_start;
 	bool ret = true;
 
-	_enter_stack.pop_back();
+	if (!_enter_stack.empty()) {
+		_enter_stack.pop_back();
+	}
 
 	switch (item_type) {
 	case ControlPointItem: