(mtext__adjust_plist_for_change): Pay attention for

the case that head is NULL.

diff --git a/src/textprop.c b/src/textprop.c
index 3d84043..e2abb67 100644 (file)
--- a/src/textprop.c
+++ b/src/textprop.c
@@ -1448,19 +1448,22 @@ mtext__adjust_plist_for_change (MText *mt, int pos, int len1, int len2)
          MTextProperty *prop;
          int i;
 
-         if (head->start == pos2)
-           head = head->prev;
-         while (tail != head)
+         if (head)
            {
-             for (i = 0; i < tail->nprops; i++)
+             if (head->start == pos2)
+               head = head->prev;
+             while (tail != head)
                {
-                 prop = tail->stack[i];
-                 if (prop->start == tail->start)
-                   prop->start += diff, prop->end += diff;
+                 for (i = 0; i < tail->nprops; i++)
+                   {
+                     prop = tail->stack[i];
+                     if (prop->start == tail->start)
+                       prop->start += diff, prop->end += diff;
+                   }
+                 tail->start += diff;
+                 tail->end += diff;
+                 tail = tail->prev;
                }
-             tail->start += diff;
-             tail->end += diff;
-             tail = tail->prev;
            }
          for (i = 0; i < tail->nprops; i++)
            tail->stack[i]->end += diff;