There was the old error message, but no entry in the Terminal app:
System log of the console:
Apr 10 11:44:25 — last message repeated 2 times —
Apr 10 11:44:47 iMac syslogd[56]: ASL Sender Statistics
Apr 10 11:44:47 iMac login[2139]: USER_PROCESS: 2139 ttys000
Apr 10 11:44:53 iMac diagnosticd[1725]: System mode client started - log (2146) - mode: 0x8
Apr 10 11:46:06 iMac diagnosticd[1725]: System mode client stopped - Console (2036) - clearing mode: 0x2, still active: 0x8
Apr 10 11:46:06 iMac systemstats[66]: assertion failed: 17E199: systemstats + 914800 [D1E75C38-62CE-3D77-9ED3-5F6D38EF0676]: 0x40
Apr 10 11:46:09 iMac diagnosticd[1725]: System mode client started - Console (2158) - mode: 0xb
Apr 10 11:46:13 iMac com.apple.xpc.launchd[1] (com.apple.imfoundation.IMRemoteURLConnectionAgent): Unknown key for integer: _DirtyJetsamMemoryLimit
Apr 10 11:46:54 iMac Console[2158]: BUG in libdispatch client: kevent[vnode] monitored resource vanished before the source cancel handler was invoked
Apr 10 11:51:15 iMac diagnosticd[1725]: System mode client stopped - Console (2158) - clearing mode: 0x2, still active: 0x8
Apr 10 11:51:15 iMac systemstats[66]: assertion failed: 17E199: systemstats + 914800 [D1E75C38-62CE-3D77-9ED3-5F6D38EF0676]: 0x40
Apr 10 11:51:17 iMac diagnosticd[1725]: System mode client started - Console (2198) - mode: 0xb
Apr 10 11:51:20 iMac com.apple.xpc.launchd[1] (com.apple.imfoundation.IMRemoteURLConnectionAgent): Unknown key for integer: _DirtyJetsamMemoryLimit
Apr 10 11:52:09 iMac Console[2198]: BUG in libdispatch client: kevent[vnode] monitored resource vanished before the source cancel handler was invoked
Apr 10 11:54:40 iMac diagnosticd[1725]: System mode client stopped - log (2146) - clearing mode: 0x0, still active: 0xb
Apr 10 11:54:40 iMac login[2139]: DEAD_PROCESS: 2139 ttys000
Apr 10 11:55:00 iMac syslogd[56]: ASL Sender Statistics
Apr 10 11:55:00 iMac login[2231]: USER_PROCESS: 2231 ttys000
Apr 10 11:55:05 iMac diagnosticd[1725]: System mode client started - log (2239) - mode: 0x8
Apr 10 11:56:14 iMac com.apple.xpc.launchd[1] (com.apple.quicklook[2251]): Endpoint has been activated through legacy launch(3) APIs. Please switch to XPC or bootstrap_check_in(): com.apple.quicklook
Apr 10 11:56:22 iMac com.apple.xpc.launchd[1] (com.apple.imfoundation.IMRemoteURLConnectionAgent): Unknown key for integer: _DirtyJetsamMemoryLimit
Apr 10 11:56:52 — last message repeated 2 times —