1 files changed, 4 insertions, 0 deletions
diff --git a/src/nvim/eval.c b/src/nvim/eval.c
index 8d517fa4d2..8d38df8421 100644
--- a/src/nvim/eval.c
+++ b/src/nvim/eval.c
@@ -8375,6 +8375,10 @@ char *do_string_sub(char *str, char *pat, char *sub, typval_T *expr, const char
       // - The substituted text.
       // - The text after the match.
       sublen = vim_regsub(&regmatch, sub, expr, tail, 0, REGSUB_MAGIC);
+      if (sublen <= 0) {
+        ga_clear(&ga);
+        break;
+      }
       ga_grow(&ga, (int)((end - tail) + sublen -
                          (regmatch.endp[0] - regmatch.startp[0])));