diff --git a/src/eap_peer/eap_pwd.c b/src/eap_peer/eap_pwd.c
index 75ceef1b0..892b5909e 100644
--- a/src/eap_peer/eap_pwd.c
+++ b/src/eap_peer/eap_pwd.c
@@ -774,7 +774,8 @@ eap_pwd_perform_confirm_exchange(struct eap_sm *sm, struct eap_pwd_data *data,
 	wpabuf_put_data(data->outbuf, conf, SHA256_MAC_LEN);
 
 fin:
-	bin_clear_free(cruft, BN_num_bytes(data->grp->prime));
+	if (data->grp)
+		bin_clear_free(cruft, BN_num_bytes(data->grp->prime));
 	BN_clear_free(x);
 	BN_clear_free(y);
 	if (data->outbuf == NULL) {