Fix a crash by "\ruby{Weierstraß}{ワイエルシュトラス}"

diff --git a/src/ltj-ruby.lua b/src/ltj-ruby.lua
index 3dff4e6..6ab3d1c 100644 (file)
--- a/src/ltj-ruby.lua
+++ b/src/ltj-ruby.lua
@@ -208,7 +208,7 @@ do
       local hh, hd = getfield(box, 'height'), getfield(box, 'depth')
       local hx = h
       while hx do
-         local hic = has_attr(hx, attr_icflag)
+         local hic = has_attr(hx, attr_icflag) or 0
         if (hic == KANJI_SKIP) or (hic == KANJI_SKIP_JFM)
             or (hic == XKANJI_SKIP) or (hic == XKANJI_SKIP_JFM)
             or ((hic<=FROM_JFM+63) and (hic>=FROM_JFM)) then