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-rw-r--r--src/nvim/eval.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/nvim/eval.c b/src/nvim/eval.c
index ec53de3269..18d6dc1444 100644
--- a/src/nvim/eval.c
+++ b/src/nvim/eval.c
@@ -7688,7 +7688,8 @@ static void f_assert_fails(typval_T *argvars, typval_T *rettv)
char_u buf[NUMBUFLEN];
char *error = (char *)get_tv_string_buf_chk(&argvars[1], buf);
- if (strstr((char *)vimvars[VV_ERRMSG].vv_str, error) == NULL) {
+ if (error == NULL
+ || strstr((char *)vimvars[VV_ERRMSG].vv_str, error) == NULL) {
prepare_assert_error(&ga);
fill_assert_error(&ga, &argvars[2], NULL, &argvars[1],
&vimvars[VV_ERRMSG].vv_tv);