Grafana - Status: 500. Message: InfluxDB returned error: error parsing query: found FROM, expected identifier, string, number, bool at line 1, char 9

Configuration
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When I want to add a new “visualization”(pane) I suddenly get this error. Where to start investigating?

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Duplicating a panel works well, but adding a new one throws the error.

I can’t click “+” after WHERE, then the browser locks.

I use POST:

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The error:
Status: 500. Message: InfluxDB returned error: error parsing query: found FROM, expected identifier, string, number, bool at line 1, char 9