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file_put_contents(): Only 0 of 131 bytes written, possibly out of free disk space

Fatal error: file_put_contents(): Only 0 of 131 bytes written, possibly out of free disk space in /www/dev/biankapizza.inweb.hu/libraries/System.php on line 9
        if(!file_exists($logFile))
            touch($logFile);
        $logContent = @file_get_contents($logFile);
        return file_put_contents($logFile, "[".date("Y-m-d H:i:s")."]: ".$content."\n".$logContent);
    }
PHP: 5.6.40-1~dotdeb+7.1, OS: Linux