whatsapp-web-incognito: Errors, is this normal?

Sometimes, the sending read receipts in… gets stuck at 1 second. The console is full of these errors.

Main.js:146 WhatsIncognito: Allowing WA packet due to exception:
Main.js:147 TypeError: exceptionsList.remove is not a function
    at Object.NodeHandler.handleSentNode (Main.js:138)
    at Main.js:43
Main.js:137 WhatsIncognito: --- Allowing READ action ---
Main.js:146 WhatsIncognito: Allowing WA packet due to exception:
Main.js:147 TypeError: exceptionsList.remove is not a function
    at Object.NodeHandler.handleSentNode (Main.js:138)
    at Main.js:43
Main.js:116 WhatsIncognito: --- Blocking PRESENCE action! ---
Main.js:146 WhatsIncognito: Allowing WA packet due to exception:
Main.js:147 TypeError: Cannot read property 'jid' of undefined
    at Object.NodeHandler.handleSentNode (Main.js:109)
    at Main.js:43

I get the "Allowing WA packet due to exception: " after each message that I send with “Enter”.