diff --git a/calendar_test.go b/calendar_test.go
index df36b80..370788b 100644
--- a/calendar_test.go
+++ b/calendar_test.go
@@ -493,3 +493,33 @@ func TestIssue77(t *testing.T) {
 		t.Fatalf("Error reading file: %s", err)
 	}
 }
+
+func TestIssue111(t *testing.T) {
+	type Test struct {
+		name string
+		fn   string
+	}
+	for _, test := range []Test{
+		{name: "Just the basis", fn: "base-structure.ics"},
+		{name: "vtimezone1 section", fn: "vtimezone1.ics"},
+		{name: "vevent1 section", fn: "vevent1.ics"},
+		{name: "vevent2 section", fn: "vevent2.ics"},
+		{name: "scheduleversion section", fn: "scheduleversion.ics"},
+		{name: "Just the basis", fn: "base-structure.ics"},
+		{name: "vevent2 without description section", fn: "vevent2-no-desc.ics"},
+		{name: "vevent2 fixed section", fn: "vevent2-fixed.ics"},
+		{name: "Full file", fn: "file1.ics"},
+	} {
+		t.Run(test.name, func(t *testing.T) {
+			calFile, err := TestData.Open("testdata/issue111/" + test.fn)
+			if err != nil {
+				t.Errorf("read file: %v", err)
+			}
+			_, err = ParseCalendar(calFile)
+			if err != nil {
+				t.Errorf("parse calendar: %v", err)
+			}
+		})
+	}
+
+}
diff --git a/testdata/issue111/base-structure.ics b/testdata/issue111/base-structure.ics
new file mode 100644
index 0000000..04ebd6f
--- /dev/null
+++ b/testdata/issue111/base-structure.ics
@@ -0,0 +1,5 @@
+BEGIN:VCALENDAR
+PRODID:-//github.com/rianjs/ical.net//NONSGML ical.net 4.0//EN
+VERSION:2.0
+X-WR-CALNAME:БСБО-01-21
+END:VCALENDAR
diff --git a/testdata/issue111/file1.ics b/testdata/issue111/file1.ics
new file mode 100644
index 0000000..bdae63a
--- /dev/null
+++ b/testdata/issue111/file1.ics
@@ -0,0 +1,44 @@
+BEGIN:VCALENDAR
+PRODID:-//github.com/rianjs/ical.net//NONSGML ical.net 4.0//EN
+VERSION:2.0
+X-WR-CALNAME:БСБО-01-21
+BEGIN:VTIMEZONE
+TZID:Europe/Moscow
+X-LIC-LOCATION:Europe/Moscow
+BEGIN:STANDARD
+TZOFFSETFROM:+0300
+TZOFFSETTO:+0300
+END:STANDARD
+END:VTIMEZONE
+BEGIN:VEVENT
+DTEND;TZID=Europe/Moscow;VALUE=DATE:20240324
+DTSTAMP;TZID=Europe/Moscow:00010101T000000
+DTSTART;TZID=Europe/Moscow;VALUE=DATE:20240323
+SEQUENCE:0
+SUMMARY:Все занятия в дистанционном формате
+TRANSP:TRANSPARENT
+UID:c68bc5ec-e46f-55ae-9f0a-9cea4365dc9b
+END:VEVENT
+BEGIN:VEVENT
+CATEGORIES:ЛК
+DESCRIPTION:Преподаватель: Корягин Сергей Викторович\n\nГруппы:\nБСБО-01-2
+ 1\nБСБО-02-21\nБСБО-04-21\n
+DTEND;TZID=Europe/Moscow:20240902T121000
+DTSTAMP:00010101T000000
+DTSTART;TZID=Europe/Moscow:20240902T104000
+LOCATION:455 (С-20)
+RRULE:FREQ=WEEKLY;INTERVAL=2;UNTIL=20241230T210000Z
+SEQUENCE:0
+SUMMARY:ЛК Создание инструментальных средств разработки программного обесп
+ ечения
+TRANSP:OPAQUE
+UID:f9de3adf-37f2-5710-abaf-27bd64443c70
+X-SCHEDULE_VERSION-ID:8
+END:VEVENT
+BEGIN:X-SCHEDULE-VERSION
+SVID:8
+X-SV-END:2024-12-30T21:00:00.0000000Z
+X-SV-START:2024-09-01T21:00:00.0000000Z
+X-SV-TYPE:SEMESTER
+END:X-SCHEDULE-VERSION
+END:VCALENDAR
diff --git a/testdata/issue111/scheduleversion.ics b/testdata/issue111/scheduleversion.ics
new file mode 100644
index 0000000..8cbe0ce
--- /dev/null
+++ b/testdata/issue111/scheduleversion.ics
@@ -0,0 +1,11 @@
+BEGIN:VCALENDAR
+PRODID:-//github.com/rianjs/ical.net//NONSGML ical.net 4.0//EN
+VERSION:2.0
+X-WR-CALNAME:БСБО-01-21
+BEGIN:X-SCHEDULE-VERSION
+SVID:8
+X-SV-END:2024-12-30T21:00:00.0000000Z
+X-SV-START:2024-09-01T21:00:00.0000000Z
+X-SV-TYPE:SEMESTER
+END:X-SCHEDULE-VERSION
+END:VCALENDAR
diff --git a/testdata/issue111/vevent1.ics b/testdata/issue111/vevent1.ics
new file mode 100644
index 0000000..93c3426
--- /dev/null
+++ b/testdata/issue111/vevent1.ics
@@ -0,0 +1,14 @@
+BEGIN:VCALENDAR
+PRODID:-//github.com/rianjs/ical.net//NONSGML ical.net 4.0//EN
+VERSION:2.0
+X-WR-CALNAME:БСБО-01-21
+BEGIN:VEVENT
+DTEND;TZID=Europe/Moscow;VALUE=DATE:20240324
+DTSTAMP;TZID=Europe/Moscow:00010101T000000
+DTSTART;TZID=Europe/Moscow;VALUE=DATE:20240323
+SEQUENCE:0
+SUMMARY:Все занятия в дистанционном формате
+TRANSP:TRANSPARENT
+UID:c68bc5ec-e46f-55ae-9f0a-9cea4365dc9b
+END:VEVENT
+END:VCALENDAR
diff --git a/testdata/issue111/vevent2-fixed.ics b/testdata/issue111/vevent2-fixed.ics
new file mode 100644
index 0000000..48efb53
--- /dev/null
+++ b/testdata/issue111/vevent2-fixed.ics
@@ -0,0 +1,21 @@
+BEGIN:VCALENDAR
+PRODID:-//github.com/rianjs/ical.net//NONSGML ical.net 4.0//EN
+VERSION:2.0
+X-WR-CALNAME:БСБО-01-21
+BEGIN:VEVENT
+CATEGORIES:ЛК
+DESCRIPTION:Преподаватель: Корягин Сергей Викторович\n\nГруппы:\nБСБО-01-2
+ 1\nБСБО-02-21\nБСБО-04-21\n
+DTEND;TZID=Europe/Moscow:20240902T121000
+DTSTAMP:00010101T000000
+DTSTART;TZID=Europe/Moscow:20240902T104000
+LOCATION:455 (С-20)
+RRULE:FREQ=WEEKLY;INTERVAL=2;UNTIL=20241230T210000Z
+SEQUENCE:0
+SUMMARY:ЛК Создание инструментальных средств разработки программного обесп
+ ечения
+TRANSP:OPAQUE
+UID:f9de3adf-37f2-5710-abaf-27bd64443c70
+X-SCHEDULE-VERSION-ID:8
+END:VEVENT
+END:VCALENDAR
diff --git a/testdata/issue111/vevent2-no-desc.ics b/testdata/issue111/vevent2-no-desc.ics
new file mode 100644
index 0000000..10bebd8
--- /dev/null
+++ b/testdata/issue111/vevent2-no-desc.ics
@@ -0,0 +1,19 @@
+BEGIN:VCALENDAR
+PRODID:-//github.com/rianjs/ical.net//NONSGML ical.net 4.0//EN
+VERSION:2.0
+X-WR-CALNAME:БСБО-01-21
+BEGIN:VEVENT
+CATEGORIES:ЛК
+DTEND;TZID=Europe/Moscow:20240902T121000
+DTSTAMP:00010101T000000
+DTSTART;TZID=Europe/Moscow:20240902T104000
+LOCATION:455 (С-20)
+RRULE:FREQ=WEEKLY;INTERVAL=2;UNTIL=20241230T210000Z
+SEQUENCE:0
+SUMMARY:ЛК Создание инструментальных средств разработки программного обесп
+ ечения
+TRANSP:OPAQUE
+UID:f9de3adf-37f2-5710-abaf-27bd64443c70
+X-SCHEDULE_VERSION-ID:8
+END:VEVENT
+END:VCALENDAR
diff --git a/testdata/issue111/vevent2.ics b/testdata/issue111/vevent2.ics
new file mode 100644
index 0000000..33a4a1b
--- /dev/null
+++ b/testdata/issue111/vevent2.ics
@@ -0,0 +1,21 @@
+BEGIN:VCALENDAR
+PRODID:-//github.com/rianjs/ical.net//NONSGML ical.net 4.0//EN
+VERSION:2.0
+X-WR-CALNAME:БСБО-01-21
+BEGIN:VEVENT
+CATEGORIES:ЛК
+DESCRIPTION:Преподаватель: Корягин Сергей Викторович\n\nГруппы:\nБСБО-01-2
+ 1\nБСБО-02-21\nБСБО-04-21\n
+DTEND;TZID=Europe/Moscow:20240902T121000
+DTSTAMP:00010101T000000
+DTSTART;TZID=Europe/Moscow:20240902T104000
+LOCATION:455 (С-20)
+RRULE:FREQ=WEEKLY;INTERVAL=2;UNTIL=20241230T210000Z
+SEQUENCE:0
+SUMMARY:ЛК Создание инструментальных средств разработки программного обесп
+ ечения
+TRANSP:OPAQUE
+UID:f9de3adf-37f2-5710-abaf-27bd64443c70
+X-SCHEDULE_VERSION-ID:8
+END:VEVENT
+END:VCALENDAR
diff --git a/testdata/issue111/vtimezone1.ics b/testdata/issue111/vtimezone1.ics
new file mode 100644
index 0000000..f40c332
--- /dev/null
+++ b/testdata/issue111/vtimezone1.ics
@@ -0,0 +1,13 @@
+BEGIN:VCALENDAR
+PRODID:-//github.com/rianjs/ical.net//NONSGML ical.net 4.0//EN
+VERSION:2.0
+X-WR-CALNAME:БСБО-01-21
+BEGIN:VTIMEZONE
+TZID:Europe/Moscow
+X-LIC-LOCATION:Europe/Moscow
+BEGIN:STANDARD
+TZOFFSETFROM:+0300
+TZOFFSETTO:+0300
+END:STANDARD
+END:VTIMEZONE
+END:VCALENDAR