inspector: fix crash when receiving non json message #258

Job	Run time
Build slim tarball	1m 45s
aarch64-linux: with shared libraries	24m 42s
x86_64-linux: with shared libraries	28m 37s
aarch64-darwin: with shared libraries	31m 11s
x86_64-darwin: with shared libraries	49m 7s
	2h 15m 22s

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