Cannot add cards in pre-existing panel

[fudu]

Checklist

• I have updated to the latest available Home Assistant version.
• I have cleared the cache of my browser.
• I have tried a different browser to see if it is related to my browser.

The problem

As in subject, when I try to add a card on preexisting Panel, get message "Which card .. etc etc", but nothing to choose, as in attached image.
If I create a new panel it goes fine

Expected behavior

Card list

Steps to reproduce

Click Configure UI
Click + button to add Card

Environment

• Home Assistant release with the issue: 0.107.1 - 0.107.2
• Last working Home Assistant release (if known): latest 0.106
• Browser and browser version: Tried with different browser - Chrome, Firefox, Edge
• Operating system: Client various - server: Vm on Qnap virtualization station

Problem-relevant configuration

Javascript errors shown in your browser console/inspector

Additional information

[zsarnett]

Are there any logs in the console of the browser?

What are the settings of that view? is it in Panel Mode?

[bramkragten]

Any custom cards?

[fudu]

Are there any logs in the console of the browser?

When I try to add cards get message in web console

• compute-unused-entities.ts:54 Uncaught (in promise) TypeError: t.cards.forEach is not a function at o (compute-unused-entities.ts:54) at compute-unused-entities.ts:54 at Array.forEach (<anonymous>) at o (compute-unused-entities.ts:54) at compute-unused-entities.ts:54 at Array.forEach (<anonymous>) at o (compute-unused-entities.ts:54) at compute-unused-entities.ts:66 at Array.forEach (<anonymous>) at a (compute-unused-entities.ts:66)

What are the settings of that view? is it in Panel Mode?

No, standard view

[fudu]

Any custom cards?

No cards at all
Attached different choices trying add cards in Preexisting Panel and in a new Panel

[bramkragten]

You have an error in your config, something should be an array but isn't.

Check for a cards that is not an array.

We should add a check for this in the code like I did for entities.

[fudu]

You have an error in your config, something should be an array but isn't.

Check for a cards that is not an array.

We should add a check for this in the code like I did for entities.

..?
Sorry, but I don't understand what you mean or how to do it.....

[bramkragten]

Check your Lovelace config for cards: there is at least one in there that does not have a list. (as it is plural it should be a list)

[fudu]

here is at least one in there that does not have a list. (as it is plural it should be a list)

I found what is the cause of the issue: a conditional card
`cards:

• entity: input_boolean.riscaldamento_manuale_on
  name: Riscaldamento Manuale
  style:
  • font-size: 12px
  • font-weight: bold
    tap_action:
    action: toggle
    type: entity-button
• card:
  cards:
  - entity: input_boolean.riscaldamento_away_on
  name: test
  tap_action:
  action: toggle
  type: entity-button
  - entity: input_boolean.riscaldamento_festa_on
  tap_action:
  action: toggle
  type: entity-button
  type: horizontal-stack
  cards: conditional
  conditions:
  • entity: input_boolean.riscaldamento_manuale_on
    state: 'on'
    type: conditional
• card:
  cards:
  - entity: input_boolean.riscaldamento_estate_on
  tap_action:
  action: toggle
  type: entity-button
  - entity: input_boolean.riscaldamento_antigelo_on
  tap_action:
  action: toggle
  type: entity-button
  type: horizontal-stack
  cards: conditional
  conditions:
  • entity: input_boolean.riscaldamento_manuale_on
    state: 'on'
    type: conditional
    title: null
    type: vertical-stack`