Warning: Undefined array key "createRoute"

[cBeyerDK]

When I go to the website i just get this message

[bugsfixing]

same

[AgentBUB]

Here is what I did to fix that error:

// look if hooks existing
if (is_countable(self::$plugins[$hook] ?? null) && count(self::$plugins[$hook] ?? 0) != 0) {
// go throug all plugins
foreach (self::$plugins[$hook] as $name) {
// check if params are given
if (!is_array($params)) {
// call plugin without params
call_user_func([$name, $hook]);
} else {
// call plugin with params
call_user_func_array([$name, $hook], $params);
}
}
}

I'll be honest though, I'm not sure if it is the best fix, but seemed to work.
I just used a Null Coalesce Operator and did a check if the array is countable.