Attempt to index boolean

Help and Feedback Scripting Support
#1

Hello, excuse me if I have made a very stupid mistake, but I keep on getting an error that I’m trying to index a boolean when it is very clearly a table I am trying to access. I have even type checked the value to make sure it is indeed a table.

local function initialise(tasks)
    for _, this_task in pairs(tasks) do
        print(type(this_task) == "table")

        if this_task.init then
            this_task:init()
        end

        this_task.__initialised = true
    end
end

return initialise

Despite this, the value somehow still becomes a boolean according to the error outputted ? Any help is appreciated.

EDIT: To add onto this, this error only occurs when the key indexed does not exist in the able, however, I would still not understand why this error is happening as it should simply just return nil.

2 Likes
#2

What line does the error happen at?

#3

Its whenever I try to index “this_task” so it would be this line that first causes trouble.

#4

That’s really bizarre. Try putting a breakpoint and screenshot the stack.

#5

Hello, sorry for the late response.

image
image1030×401 23 KB

The values seem to check out as a table.

Without breakpoint:

image
image786×109 5.6 KB

Seems to think that this_task is a boolean somehow…

#6

Have you tried adding a print(_, “:”, task) within the for loop? Maybe the break point is a bit of a red herring and stopping before the error actually would occur.

#7

Yes, I have tried doing that. Though the loop literally errors on the first iteration. If I put it before the line where it tries to index this_task it shows me that it is a table, any point afterwards and nothing is shown because it errors.

#8

Is init method modified anywhere else? Though I don’t think it’s related to the problem… I tried to recreate a similar scenario like this and it worked.

1 Like
#9

Just to be sure, does your this_task table have any metatables?

4 Likes
#10

Very strange. A dodgy fix for this would be to try and wrap the init call in a pcall.

Another thing you could try is something like:

local initFunction = (type(this_task) == “table”) and task_task.init 

if initFunction then 
    initFunction(this_task)
end

I know this should make no difference in a practical sense but may produce a slightly different error that may provide a clue

#11

That’s strange… Even this seems to produce the same error I am having. Since the first operand was true, that would lead us to believe that is definitely a table… Though it still seems that when we get to the second operand, this_task somehow turns into a boolean value…

1 Like
#12

That’s very strange. It passes the first check but not the second one?

#13

Yep, that’s correct. It passes the first operand completely fine.

#14

This is not the issue right? The variable name is wrong here.

1 Like
#15

No that’s not the issue, I noticed his spelling mistake and corrected it accordingly in my own script.

#16

Let me repeat what @takticiadam said since you didn’t answer this question.

It’s possible it has a metatable with an __index field that produces this error message. __index only runs if the key table is trying to get doesn’t exist, hence

this_task cannot turn into a boolean.

1 Like
#17

Oh, I apolagise, I didn’t even see his message. It turns out that it is indeed related to a metatable which I set to this_task with an __index feild. It all makes sense now. Such a stupid mistake for me to have make. Thank you to those who spent their time replying.