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-rw-r--r--src/nvim/fold.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/nvim/fold.c b/src/nvim/fold.c
index c9699cb161..b59933d600 100644
--- a/src/nvim/fold.c
+++ b/src/nvim/fold.c
@@ -1658,7 +1658,7 @@ static void foldDelMarker(buf_T *buf, linenr_T lnum, char *marker, size_t marker
if (*cms != NUL) {
// Also delete 'commentstring' if it matches.
char *cms2 = strstr(cms, "%s");
- if (p - line >= cms2 - cms
+ if (cms2 != NULL && p - line >= cms2 - cms
&& strncmp(p - (cms2 - cms), cms, (size_t)(cms2 - cms)) == 0
&& strncmp(p + len, cms2 + 2, strlen(cms2 + 2)) == 0) {
p -= cms2 - cms;