Fix crash when generating screenshots (F9 key) #1581

Job	Run time
linux (aarch64)	28m 58s
linux (armhf)	23m 9s
linux (i386)	28m 10s
linux (riscv64)	24m 6s
linux (x86_64)	21m 44s
linux-x86_64-debug	1h 4m 27s
lto	2h 17m 1s
headless	45m 49s
macos (universal-10.15)	1h 52m 11s
modaudio (modduo, modduo-static, MODDUO=true)	48m 25s
modaudio (modduox, modduox-static)	50m 25s
modaudio (moddwarf, moddwarf)	41m 3s
plugin-validation	1h 9m 33s
source-tarball	18m 30s
sysdeps	58m 52s
wasm (simd)	1h 29m 57s
wasm (nosimd)	1h 23m 58s
windows (win32)	35m 52s
windows (win64)	51m 22s
	17h 13m 32s

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