If(...) will not be executed.

[Tuetenpenner]

This is my first Addon and I need some Help. The if() which includes the function FollowUnit() will not be executed. Also my OnWhisper() function seems to be executed twice.

local f = CreateFrame("Frame");
f:RegisterEvent("CHAT_MSG_WHISPER");
f:RegisterEvent("CHAT_MSG_BN_WHISPER");
 
function Follower_OnLoad()
    DEFAULT_CHAT_FRAME:AddMessage("Follower Loaded!", 1.0, 0.0, 0.0, 3.0);
end
 
f:SetScript("OnEvent", function(self, event, ...)
    if(event == "CHAT_MSG_WHISPER" or "CHAT_MSG_BN_WHISPER") then
        local arg1, arg2 = ...
 
            if(event == "CHAT_MSG_BN_WHISPER") then -- Yet no function.
 
            end
 
            OnWhisper(arg1, arg2)
    end
end)
 
function OnWhisper(arg1, arg2) -- The whole function seems to be executed twice.
    if (arg1 == "f_follow") then
        print("Following " .. arg2)
 
            if (CheckInteractDistance(arg2, 4)) then -- This part will not be executed. Instead it goes to the else part.
                FollowUnit(arg2)
            else
                SendChatMessage("I'm too far away to follow you!", "WHISPER", nil, arg2)
            end
    end
end