fix build and small bugfix #81

Job	Run time
Go tests	23m 49s
Go tests on Windows	10m 42s
golangci-lint	3m 10s
Go tests with previous Go version	6m 50s
Mixins tests	2m 26s
UI tests	2m 23s
Build Prometheus for all architectures	0s
Build Prometheus for common architectures (0)	6m 31s
fuzzing	0s
Build Prometheus for common architectures (1)	6m 15s
Build Prometheus for common architectures (2)	6m 25s
codeql / Analyze (go)	6m 56s
codeql / Analyze (javascript)	1m 31s
Publish UI on npm Registry	1m 15s
Publish release artefacts	0s
Publish main branch artifacts	0s
	1h 18m 13s

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