Check ptr to string before use it

olegrok · olegrok · commit 8ee8b16c7693 · 2019-12-10T21:21:31.000+03:00
Closes #51
diff --git a/http/lib.c b/http/lib.c
@@ -114,6 +114,9 @@ lbox_httpd_escape_html(struct lua_State *L)
 			continue;
 		}
 		const char *s = lua_tostring(L, i);
+		if (s == NULL) {
+			continue;
+		}
 		for (; *s; s++) {
 			switch(*s) {
 				case '&':
