inspector: fix crash when receiving non json message #357

Job	Run time
Build slim tarball	1m 30s
x86_64-darwin: with shared libraries	2h 3m 27s
aarch64-linux: with shared libraries	51m 13s
aarch64-darwin: with shared libraries	43m 58s
x86_64-linux: with shared libraries	51m 33s
	4h 31m 41s

Provide feedback