Happens a lot. Bad programming in hooks and apps. The older php versions were not so picky about these types of errors, so you can use ftp and edit the initdata.php file changing
this
//--------------------------------------------------------------------------
// ADVANCED CONFIGURATION: ERROR REPORTING
//--------------------------------------------------------------------------
error_reporting( E_STRICT | E_ERROR | E_WARNING | E_PARSE | E_RECOVERABLE_ERROR | E_COMPILE_ERROR | E_USER_ERROR | E_USER_WARNING );
to this
//--------------------------------------------------------------------------
// ADVANCED CONFIGURATION: ERROR REPORTING
//--------------------------------------------------------------------------
error_reporting( E_ERROR | E_PARSE | E_RECOVERABLE_ERROR | E_COMPILE_ERROR | E_USER_ERROR | E_USER_WARNING );