Fix error during install

index.php

@@ -89,7 +89,10 @@ if (
 /**
  * Persistent (stay logged in)
  */
-if (isset($_COOKIE[COOKIE_PERSISTENT])) {
+if (isset($_COOKIE[COOKIE_PERSISTENT]) && $database) {
+    $table_sessions_exists = $database->tableExists('sessions');
+
+    if ($table_sessions_exists) {
         $persistent = $database
         ->query(
             'SELECT *
@@ -101,6 +104,7 @@ if (isset($_COOKIE[COOKIE_PERSISTENT])) {
         if (false !== $persistent) {
             $_SESSION['user'] = User::getFromID($persistent['user']);
         }
+    }
 }
 
 /**

src/classes/database.php

@@ -50,4 +50,25 @@ class Database
     {
         return $this->lastInsertId;
     }
+
+    public function tableExists(string $table_to_check): bool
+    {
+        $tables = $this
+        ->query('SHOW TABLES;')
+        ->fetchAll();
+
+        if (!is_iterable($tables)) {
+            return false;
+        }
+
+        foreach ($tables as $table_kv) {
+            $table = reset($table_kv);
+
+            if ($table === $table_to_check) {
+                return true;
+            }
+        }
+
+        return false;
+    }
 }