From d53c2ec21518aee0df3eef3476cc8f3f9fb7d1a5 Mon Sep 17 00:00:00 2001
From: Enrico Forestieri <forenr@lyx.org>
Date: Thu, 6 Aug 2009 09:53:06 +0000
Subject: [PATCH] Fix bug #6014: Assertion when pasting "\def" into 2.0svn

git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@30870 a592a061-630c-0410-9148-cb99ea01b6c8
---
 src/mathed/MathMacroTemplate.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/mathed/MathMacroTemplate.cpp b/src/mathed/MathMacroTemplate.cpp
index 3014cc4ee7..6cccd8fa6a 100644
--- a/src/mathed/MathMacroTemplate.cpp
+++ b/src/mathed/MathMacroTemplate.cpp
@@ -670,8 +670,10 @@ void MathMacroTemplate::shiftArguments(size_t from, int by)
 
 int MathMacroTemplate::maxArgumentInDefinition() const
 {
+	// We don't have a buffer when pasting from the clipboard (bug 6014).
+	Buffer const * macro_buffer = this->isBufferValid() ? &buffer() : 0;
 	int maxArg = 0;
-	DocIterator it = doc_iterator_begin(&buffer(), this);
+	DocIterator it = doc_iterator_begin(macro_buffer, this);
 	it.idx() = defIdx();
 	for (; it; it.forwardChar()) {
 		if (!it.nextInset())
-- 
2.39.2