Describe the bug
Selecting characters in dropdown results in lua error.

To Reproduce

Addon version:

• Version 0.1.7

Lua eror (if any):
<1x ...rfaceCompanionsTracker/GUI/OverviewFrame.lua:260: attempt to index field 'owner' (a nil value)
[string "@CompanionsTracker/GUI/OverviewFrame.lua"]:260: in function func' [string "@Blizzard_FrameXML/Mainline/NavigationBar.lua"]:298: in function <Blizzard_FrameXML/Mainline/NavigationBar.lua:294> [string "=(tail call)"]: ? [string "=[C]"]: in function securecallfunction'
[string "@Blizzard_Menu/Menu.lua"]:854: in function `Pick'
[string "@Blizzard_Menu/MenuTemplates.lua"]:64: in function <Blizzard_Menu/MenuTemplates.lua:58>

Locals:
self = Button {
menuPointX = 0
Event =

{
}
intrinsic = "DropdownButton"
Art = Texture {
}
callbackTables = {
}
menuRelativePoint = "BOTTOMLEFT"
menuPointY = 0
menuDescription = {
}
menuAnchor = {
}
PushedTexture = Texture {
}
NormalTexture = Texture {
}
menuPoint = "TOPLEFT"
menu = Frame {
}
}
id = "Ratbull-Deathwing"
_navNar = Frame {
overlay = Frame {
}
template = "NavButtonTemplate"
homeButton = TopHomeButton {
}
overflowButton = TopOverflowButton {
}
navList = {
}
KioskOverlay = Frame {
}
freeButtons = {
}
widthBuffer = 20
home = TopHomeButton {
}
overflow = TopOverflowButton {
}
}
(*temporary) = {
characterListFrame = Frame {
}
tabsData = {
}
expanionBackground = Texture {
}
base = {
}
AceGUIWidgetVersion = 1
buttonsFrameGroup = {
}
localstatus = {
}
content = Frame {
}
missionsTabGroup = {
}
userdata = {
}
scrollFrame = {
}
type = "ExpansionOverviewFrame"
events = {
}
children = {
}
subFrameRenderFrame = {
}
expansionTitle = FontString {
}
navBar = Frame {
}
frame = CompanionsTrackerExpansionOverviewFrame1 {
}
selectedTab = 9
}
(*temporary) = nil
(*temporary) = nil
(*temporary) = "attempt to index field 'owner' (a nil value)"
frame = {
characterListFrame = Frame {
}
tabsData = {
}
expanionBackground = Texture {
}
base = {
}
AceGUIWidgetVersion = 1
buttonsFrameGroup = {
}
localstatus = {
}
content = Frame {
}
missionsTabGroup = {
}
userdata = {
}
scrollFrame = {
}
type = "ExpansionOverviewFrame"
events = {
}
children = {
}
subFrameRenderFrame = {
}
expansionTitle = FontString {
}
navBar = Frame {
}
frame = CompanionsTrackerExpansionOverviewFrame1 {
}
selectedTab = 9
}