Core dump when compile with gcc 10 about libxo HOT 3 OPEN

diff --git a/libxo/libxo.c b/libxo/libxo.c
index 916a111..ea71723 100644
--- a/libxo/libxo.c
+++ b/libxo/libxo.c
@@ -4300,7 +4300,8 @@ xo_format_value (xo_handle_t *xop, const char *name, ssize_t nlen,
        if ((xsp->xs_flags & (XSF_EMIT | XSF_EMIT_KEY))
            || !(xsp->xs_flags & XSF_EMIT_LEAF_LIST)) {
            char nbuf[nlen + 1];
-           memcpy(nbuf, name, nlen);
+            if (name)
+             memcpy(nbuf, name, nlen);
            nbuf[nlen] = '\0';

            ssize_t rc = xo_transition(xop, 0, nbuf, XSS_EMIT_LEAF_LIST);
@@ -4324,7 +4325,8 @@ xo_format_value (xo_handle_t *xop, const char *name, ssize_t nlen,

        } else if (!(xsp->xs_flags & XSF_EMIT_KEY)) {
            char nbuf[nlen + 1];
-           memcpy(nbuf, name, nlen);
+            if (name)
+             memcpy(nbuf, name, nlen);
            nbuf[nlen] = '\0';

            ssize_t rc = xo_transition(xop, 0, nbuf, XSS_EMIT);
@@ -4342,7 +4344,8 @@ xo_format_value (xo_handle_t *xop, const char *name, ssize_t nlen,
        if ((xsp->xs_flags & XSF_EMIT_LEAF_LIST)
            || !(xsp->xs_flags & XSF_EMIT)) {
            char nbuf[nlen + 1];
-           memcpy(nbuf, name, nlen);
+            if (name)
+             memcpy(nbuf, name, nlen);
            nbuf[nlen] = '\0';

            ssize_t rc = xo_transition(xop, 0, nbuf, XSS_EMIT);