After I added task in calendar and click on checkbox to display all events from this calendar, korganizer crashed. If I click on calendar that haven't any events, application doesn't crash.

Reproducible: Always

Steps to Reproduce:
1. Start korganizer
2. Click on checkbox to display events from calendar.



All logs from korganizer execution:
organizer
""
()
connectToServer "/tmp/akonadi-vladyslav.IGew0S/akonadiserver.socket"
"/subscriber/korganizer_2796_f3rz2p"
connectToServer "/tmp/akonadi-vladyslav.IGew0S/akonadiserver.socket"
"ETMCalendar"
connectToServer "/tmp/akonadi-vladyslav.IGew0S/akonadiserver.socket"
"/subscriber/korganizer_2796_KOXohw"
connectToServer "/tmp/akonadi-vladyslav.IGew0S/akonadiserver.socket"
"/subscriber/korganizer_2796_GIlCNK"
connectToServer "/tmp/akonadi-vladyslav.IGew0S/akonadiserver.socket"
"/subscriber/korganizer_2796_ybepLY"
connectToServer "/tmp/akonadi-vladyslav.IGew0S/akonadiserver.socket"
"/subscriber/korganizer_2796_3yedL9"
connectToServer "/tmp/akonadi-vladyslav.IGew0S/akonadiserver.socket"
KServiceTypeTrader: serviceType "KOrganizer/Part" not found
done
Connected to "Akonadi" , using protocol version 52
Server says: "Not Really IMAP server"
Connected to "Akonadi" , using protocol version 52
Server says: "Not Really IMAP server"
Connected to "Akonadi" , using protocol version 52
Server says: "Not Really IMAP server"
Connected to "Akonadi" , using protocol version 52
Server says: "Not Really IMAP server"
org.kde.akonadi.ETM: GEN true false true
org.kde.akonadi.ETM: collection: QVector()
Connected to "Akonadi" , using protocol version 52
Server says: "Not Really IMAP server"
Connected to "Akonadi" , using protocol version 52
Server says: "Not Really IMAP server"
Connected to "Akonadi" , using protocol version 52
Server says: "Not Really IMAP server"
org.kde.akonadi.ETM: Subtree:  5 QSet(5)
org.kde.akonadi.ETM: collection: "akonadi_ical_resource_0"
org.kde.akonadi.ETM: Subtree:  15 QSet(15)
org.kde.akonadi.ETM: collection: "Навчання"
org.kde.akonadi.ETM: Subtree:  1 QSet(27, 26, 1)
org.kde.akonadi.ETM: collection: "DeclinedInvitations"
org.kde.akonadi.ETM: collection: "OpenInvitations"
org.kde.akonadi.ETM: collection: "Search"
org.kde.akonadi.ETM: Fetch job took  175 msec
org.kde.akonadi.ETM: was collection fetch job: collections: 5
org.kde.akonadi.ETM: first fetched collection: "Search"
 PLUGIN : identifier "application/octet-stream@QByteArray"
registering Desktop file "/usr/share/akonadi/plugins/serializer//akonadi_serializer_addressee.desktop" for ("text/vcard", "text/directory") @ ("legacy", "default", "KContacts::Addressee")
registering Desktop file "/usr/share/akonadi/plugins/serializer//akonadi_serializer_contactgroup.desktop" for ("application/x-vnd.kde.contactgroup") @ ("legacy", "default", "KContacts::ContactGroup")
registering Desktop file "/usr/share/akonadi/plugins/serializer//akonadi_serializer_kalarm.desktop" for ("application/x-vnd.kde.alarm", "application/x-vnd.kde.alarm.active", "application/x-vnd.kde.alarm.archived", "application/x-vnd.kde.alarm.template") @ ("default", "KAlarmCal::KAEvent")
registering Desktop file "/usr/share/akonadi/plugins/serializer//akonadi_serializer_kcalcore.desktop" for ("text/calendar", "application/x-vnd.akonadi.note", "application/x-vnd.kde.notes") @ ("default", "KCalCore::Incidence*")
registering Desktop file "/usr/share/akonadi/plugins/serializer//akonadi_serializer_mail.desktop" for ("message/rfc822", "message/news", "text/x-vnd.akonadi.note") @ ("legacy", "default", "KMime::Message*")
ItemSerializerPluginLoader:  found 32 plugins. 

 PLUGIN : identifier "text/vcard@KContacts::Addressee"
 PLUGIN : identifier "application/x-vnd.kde.alarm.template@KAlarmCal::KAEvent"
 PLUGIN : identifier "message/news@default"
 PLUGIN : identifier "text/calendar@default"
 PLUGIN : identifier "application/x-vnd.kde.alarm.archived@KAlarmCal::KAEvent"
 PLUGIN : identifier "application/x-vnd.kde.contactgroup@KContacts::ContactGroup"
 PLUGIN : identifier "application/x-vnd.kde.notes@default"
 PLUGIN : identifier "text/x-vnd.akonadi.note@KMime::Message*"
 PLUGIN : identifier "text/directory@default"
 PLUGIN : identifier "message/rfc822@default"
 PLUGIN : identifier "application/x-vnd.kde.alarm.archived@default"
 PLUGIN : identifier "application/x-vnd.kde.contactgroup@legacy"
 PLUGIN : identifier "text/vcard@default"
 PLUGIN : identifier "message/news@legacy"
 PLUGIN : identifier "application/x-vnd.kde.alarm.active@default"
 PLUGIN : identifier "application/x-vnd.kde.alarm.template@default"
 PLUGIN : identifier "text/x-vnd.akonadi.note@legacy"
 PLUGIN : identifier "application/x-vnd.kde.notes@KCalCore::Incidence*"
 PLUGIN : identifier "message/rfc822@legacy"
 PLUGIN : identifier "text/directory@KContacts::Addressee"
 PLUGIN : identifier "application/x-vnd.akonadi.note@KCalCore::Incidence*"
 PLUGIN : identifier "application/x-vnd.kde.alarm@KAlarmCal::KAEvent"
 PLUGIN : identifier "application/x-vnd.kde.alarm.active@KAlarmCal::KAEvent"
 PLUGIN : identifier "application/x-vnd.akonadi.note@default"
 PLUGIN : identifier "message/rfc822@KMime::Message*"
 PLUGIN : identifier "message/news@KMime::Message*"
 PLUGIN : identifier "application/x-vnd.kde.contactgroup@default"
 PLUGIN : identifier "text/vcard@legacy"
 PLUGIN : identifier "text/directory@legacy"
 PLUGIN : identifier "text/x-vnd.akonadi.note@default"
 PLUGIN : identifier "application/x-vnd.kde.alarm@default"
 PLUGIN : identifier "text/calendar@KCalCore::Incidence*"
org.kde.akonadi.ETM: Fetch job took  107 msec
org.kde.akonadi.ETM: was item fetch job: items: 2
org.kde.akonadi.ETM: Fetch job took  154 msec
org.kde.akonadi.ETM: was item fetch job: items: 41
org.kde.akonadi.ETM: Fetch job took  180 msec
org.kde.akonadi.ETM: was item fetch job: items: 0
org.kde.akonadi.ETM: Fetch job took  200 msec
org.kde.akonadi.ETM: was item fetch job: items: 0
org.kde.akonadi.ETM: Fetch job took  217 msec
org.kde.akonadi.ETM: was item fetch job: items: 0
korganizer: symbol lookup error: /usr/lib64/libKF5CalendarSupport.so.5: undefined symbol: _ZN9KCalUtils18IncidenceFormatter19extensiveDisplayStrERK7QStringRK14QSharedPointerIN8KCalCore13IncidenceBaseEERK5QDateRKN9KDateTime4SpecE