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fix index of nil value #6021

Job	Run time
docs / Build linux64	1m 21s
lint / lint	1s
test / Linux gcc-12 / Build linux64	1m 58s
test / Windows MSVC / Build win64	5m 51s
test / Linux gcc-10 / Build linux64	12m 50s
test / Run Windows test suite / Test (windows, msvc, default plugins, default config)	57s
test / Run Windows test suite (empty config) / Test (windows, msvc, default plugins, empty config)	1m 19s
test / Run Linux test suite	0s
test / Run Linux test suite (gcc-12, all plugins)	0s
lint / lint	24s
test / Linux gcc-10 / Build linux64	1m 30s
docs / Build linux64	1m 21s
test / Windows MSVC / Build win64	5m 51s
test / Linux gcc-12 / Build linux64	1m 58s
test / Run Windows test suite (empty config) / Test (windows, msvc, default plugins, empty config)	1m 19s
test / Run Windows test suite / Test (windows, msvc, default plugins, default config)	57s
test / Run Linux test suite / Test (ubuntu, gcc-10, default plugins, default config)	1m 1s
test / Run Linux test suite (gcc-12, all plugins) / Test (ubuntu, gcc-12, all plugins, default config)	2m 25s
	41m 3s

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