Argument #1 is not an array

[I-am-possible]

After uploading it:

Warning: array_merge(): Argument #1 is not an array in /beta/index.php on line 77
Warning: array_merge(): Argument #1 is not an array in /beta/index.php on line 78

The lines are:

foreach (glob(dirname($pattern).'/*') as $dir) {
$first_files = array_merge($first_files, $this->readDirectory($dir.'/'.basename($pattern)));

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Btw.: The users need PHP 5.4 and up, otherwise it will stop because of the [] synthax (and more).
I am on 5.6 actually unless the dev says it will still work with 7.1.

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EDIT: I also have this error:
Warning: Invalid argument supplied for foreach() in /beta/backend/templates/_footer.php on line 5

EDIT2: And this one:
5
Warning: Invalid argument supplied for foreach() in /beta/backend/plugins/PluginAutoLink.php on line 18

I think they have just errors because of the same.

[lukasfrydek]

Edit first line from:
foreach (glob(dirname($pattern).'/*') as $dir) {
To:
foreach (glob(dirname($pattern).'/*', GLOB_ONLYDIR) as $dir) {