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-rw-r--r--src/nvim/screen.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/nvim/screen.c b/src/nvim/screen.c
index 760a54a316..5bf5a471c1 100644
--- a/src/nvim/screen.c
+++ b/src/nvim/screen.c
@@ -3154,6 +3154,7 @@ static int win_line(win_T *wp, linenr_T lnum, int startrow, int endrow,
mb_utf8 = false;
}
} else {
+ assert(p_extra != NULL);
c = *p_extra;
mb_c = c;
// If the UTF-8 character is more than one byte: