Displaying Database Tags in a Repeater

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I think the reason why your CODE doesn’t work is because of EMPTY-FIELDs.
You can see it in your error-logs…

Index-0 has —> 2-items ==> LENGTH =2
Index-1 has —> 0-items ==> LENGTH = undefined
Index-2 has —> 0-items ==> LENGTH = undefined
Index-3 has —> 0-items ==> LENGTH = undefined

Perhaps this one will work for you…

export function repeater1_itemReady($item, itemData, index){
    let options = [];
    let tags = itemData.tipoActividad;
    let tagLength = tags.length;

    console.log("Item-Data: ", itemData)
    console.log("Index: ", index)
    console.log("Tags: ", tags)

    if(tagLength!==undefined){   
       for(var i=0; i<tagLength; i++){        
            options.push({"label": tags[i],"value": tags[i]})
            $item("#selectionTags2").options = options;
        }
    }
}