diff --git a/adminer/include/adminer.inc.php b/adminer/include/adminer.inc.php
index 5d0aebb6..4990399c 100644
--- a/adminer/include/adminer.inc.php
+++ b/adminer/include/adminer.inc.php
@@ -956,6 +956,7 @@ class Adminer {
echo "
\n" . script("mixin(qs('#logins'), {onmouseover: menuOver, onmouseout: menuOut});");
}
} else {
+ $tables = array();
if ($_GET["ns"] !== "" && !$missing && DB != "") {
$connection->select_db(DB);
$tables = table_status('', true);
diff --git a/adminer/include/auth.inc.php b/adminer/include/auth.inc.php
index b8ce053f..ed104154 100644
--- a/adminer/include/auth.inc.php
+++ b/adminer/include/auth.inc.php
@@ -41,7 +41,7 @@ function add_invalid_login() {
function check_invalid_login() {
global $adminer;
$invalids = unserialize(@file_get_contents(get_temp_dir() . "/adminer.invalid")); // @ - may not exist
- $invalid = $invalids[$adminer->bruteForceKey()];
+ $invalid = ($invalids ? $invalids[$adminer->bruteForceKey()] : array());
$next_attempt = ($invalid[1] > 29 ? $invalid[0] - time() : 0); // allow 30 invalid attempts
if ($next_attempt > 0) { //! do the same with permanent login
auth_error(lang('Too many unsuccessful logins, try again in %d minute(s).', ceil($next_attempt / 60)));
diff --git a/changes.txt b/changes.txt
index a7275a52..d5211cc1 100644
--- a/changes.txt
+++ b/changes.txt
@@ -1,4 +1,5 @@
Adminer 4.8.1-dev:
+Fix more PHP 8 warnings (bug #781)
Adminer 4.8.0 (released 2021-02-10):
Support function default values in insert (bug #713)