MT5 off quotes / no quotes error

Causes, most likely first

1. Liquidity has genuinely dried up

Around a major release, at the rollover, or in the first seconds of the Sunday open, there may briefly be no price the broker will commit to. The symbol is open and untradeable simultaneously, which is why it reads as a bug.

2. The symbol is not subscribed in Market Watch

A symbol that has never been displayed may have no live quote stream. Adding it to Market Watch and letting it tick before trading resolves it. This is common immediately after an EA is attached to a fresh terminal.

3. The quote is stale

If the terminal has not received a tick recently, the last known price may be too old to trade against. This often accompanies a connection problem rather than being independent of it — see no connection to trade server.

Why this happens

The useful distinction is between "market closed" and "off quotes". Closed is a schedule and it is predictable. Off quotes is a liquidity condition and it is not — it happens inside normal trading hours, usually for a few seconds, usually at the worst moment.

An EA should treat it as a temporary refusal and re-evaluate on the next tick rather than as a hard failure. Equally it should not retry in a tight loop, because a price that does not exist will not exist any faster for being asked repeatedly.