includes/acp/acp_mods.php

(Modification w/ children)
When you upload a modification and look at the options within the AutoMOD tab, it shows the options of the mod correctly.
After installing it, it creates a debug message saying:
[phpBB Debug] PHP Warning: in file [ROOT]/includes/acp/acp_mods.php on line 1976: Illegal string offset 'realname'

The issue is that there is not always an index "realname" when your mod has children related to the mod (e.g. language files)
Workaround:
find in includes/acp/acp_mod.php ->
if ($file['realname'] == $row['lang_iso'])

replace with ->
if (isset($file['realname']) AND $file['realname']== $row['lang_iso'])