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Fix potential crash for unknown inner type #318

Job	Run time
windows (win64_mingw73, 3.10, 5.12.*, x64)	2m 22s
ubuntu (20.04)	4m 4s
windows (win64_msvc2017_64, 3.6, x64, 5.11.*)	3m 9s
oldschool (centos, 7, python-debug, debug)	2m 40s
ubuntu (22.04)	2m 38s
macOS (11, 3.6, 5.9.*, release)	4m 29s
windows (win32_mingw53, 3.6, x86, 5.11.*)	3m 13s
oldschool (centos, 7, python-debug, release)	2m 43s
macOS (11, 3.6, 5.9.*, debug)	2m 44s
oldschool (rockylinux, 9, python3-devel, release)	1m 54s
macOS (12, 3.11, 5.12.*, debug)	2m 5s
	32m 1s

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