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diff -up patch-2.7.1/src/pch.c.me patch-2.7.1/src/pch.c
--- patch-2.7.1/src/pch.c.me 2018-11-22 14:09:28.099973290 +0100
+++ patch-2.7.1/src/pch.c 2018-11-22 14:17:57.741797271 +0100
@@ -2278,7 +2278,7 @@ pfetch (lin line)
bool
pch_write_line (lin line, FILE *file)
{
- bool after_newline = p_line[line][p_len[line] - 1] == '\n';
+ bool after_newline = (p_len[line] > 0) && (p_line[line][p_len[line] - 1] == '\n');
if (! fwrite (p_line[line], sizeof (*p_line[line]), p_len[line], file))
write_fatal ();
return after_newline;