Chrome Extension error: “Unchecked runtime.lastError while running browserAction.setIcon: No tab with id”

Question

I\'m coding my Google Chrome Extension where I set the app\'s icon from the background script as such:

try
{
    objIcon = {
        \"19\": \"image         


        

Answer 1

Include a callback and check chrome.runtime.lastError.

objIcon = {
    "19": "images/icon19.png",
    "38": "images/icon38.png"
};

function callback() {
    if (chrome.runtime.lastError) {
        console.log(chrome.runtime.lastError.message);
    } else {
        // Tab exists
    }
}

chrome.browserAction.setIcon({
    path: objIcon,
    tabId: nTabID

}, callback);