From 96cd45a9a804ea3c1991506fc3732b708cfb2992 Mon Sep 17 00:00:00 2001
From: Juergen Spitzmueller <spitz@lyx.org>
Date: Sun, 10 Sep 2017 19:43:27 +0200
Subject: [PATCH] Fix #10760

---
 lib/lyx2lyx/lyx_2_3.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/lyx2lyx/lyx_2_3.py b/lib/lyx2lyx/lyx_2_3.py
index 73ac45cf00..edc5b1ffa9 100644
--- a/lib/lyx2lyx/lyx_2_3.py
+++ b/lib/lyx2lyx/lyx_2_3.py
@@ -1996,7 +1996,8 @@ def revert_mathindent(document):
     i = find_re(document.header, regexp, 0)
     if i != -1:
         value = get_value(document.header, "\\math_indentation" , i).split()[0]
-        add_to_preamble(document, ["\\setlength{\\mathindent}{" + value + '}'])
+        if value != "default":
+            add_to_preamble(document, ["\\setlength{\\mathindent}{" + value + '}'])
         del document.header[i]
     # now set the document class option
     regexp = re.compile(r'(\\is_math_indent 1)')