fix: add missing nil checks (backport #1299) #3987

Job	Run time
cleanup-runs	6s
install-tparse	15s
split-test-files	14s
build (amd64, gcc)	45s
test-cosmovisor	2m 40s
build (arm64, aarch64-linux-gnu-gcc, g++-aarch64-linux-gnu)	1m 30s
tests (00)	4m 0s
tests (01)	6m 35s
test-race (00)	3m 55s
tests (02)	5m 11s
test-race (01)	3m 13s
tests (03)	3m 43s
test-race (02)	2m 6s
test-race (03)	2m 24s
upload-coverage-report	26s
	37m 3s

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