Warning: Illegal string offset '_id' in /var/www/lib/tt4lib/src/class.ModuleData.php on line 107

Fatal error: Uncaught exception 'MongoException' with message 'Invalid object ID' in /var/www/lib/tt4lib/src/class.ModuleData.php:257
Stack trace:
#0 /var/www/lib/tt4lib/src/class.ModuleData.php(257): MongoId->__construct('M')
#1 /var/www/lib/tt4lib/src/class.ModuleData.php(111): ModuleData::getModuleRef(Array, Array, true)
#2 /var/www/lib/tt4lib/phplib/class.TT4FrontEnd.php(261): ModuleData::getRecord(Array, 'why-music')
#3 /var/www/lib/tt4lib/phplib/class.TT4FrontEnd.php(92): TT4FrontEnd->view()
#4 [internal function]: TT4FrontEnd->_default()
#5 /var/www/lib/tt4lib/src/class.Module.php(295): call_user_func_array(Array, Array)
#6 /var/www/lib/tt4lib/src/class.Module.php(276): Module->_runDefault()
#7 /var/www/lib/tt4lib/src/class.Page.php(686): Module->execute('')
#8 /var/www/lib/tt4lib/src/class.Page.php(579): Page::_includeModules('{% module src="...')
#9 /var/www/lib/tt4lib/src/class.Page.php(356): Page::_processHTML('{% module src="...')
#10 /var/www/sites/eotours/index.php(30): Page::show()
#11 {main}
  thrown in /var/www/lib/tt4lib/src/class.ModuleData.php on line 257