jackc/pgx · error

cannot scan NULL into %T

Error message

cannot scan NULL into %T

What it means

Error "cannot scan NULL into %T" thrown in jackc/pgx.

Source

Thrown at pgtype/float8.go:245

	case TextFormatCode:
		switch target.(type) {
		case *float64:
			return scanPlanTextAnyToFloat64{}
		case Float64Scanner:
			return scanPlanTextAnyToFloat64Scanner{}
		case Int64Scanner:
			return scanPlanTextAnyToInt64Scanner{}
		}
	}

	return nil
}

type scanPlanBinaryFloat8ToFloat64 struct{}

func (scanPlanBinaryFloat8ToFloat64) Scan(src []byte, dst any) error {
	if src == nil {
		return fmt.Errorf("cannot scan NULL into %T", dst)
	}

	raw, err := pgio.Uint64Exact(src)
	if err != nil {
		return fmt.Errorf("float8: %w", err)
	}

	n := int64(raw)
	f := (dst).(*float64)
	*f = math.Float64frombits(uint64(n))

	return nil
}

type scanPlanBinaryFloat8ToFloat64Scanner struct{}

func (scanPlanBinaryFloat8ToFloat64Scanner) Scan(src []byte, dst any) error {
	s := (dst).(Float64Scanner)

View on GitHub (pinned to ec1a0befd2)

When it happens

Trigger: Thrown at pgtype/float8.go:245 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of jackc/pgx@ec1a0befd2 (2026-08-04). Data as JSON: /data/errors/bdbb381d1195aa12.json. Report an issue: GitHub.