Errors keep repeating after adding and then removing a monitor

[Simpler1]

Describe Your Environment

• ZoneMinder v 1.37.40 from zoneminder-base nightly
• Full name and version of OS: Linux Mint 20.3 Cinnamon
• Browser: Chrome Version 112.0.5615.165 (Official Build) (64-bit)

Describe the bug
Add a new monitor, then delete the monitor.
The log file keeps repeating the following errors:

2023/05/10-12:27:41 | zms_m3 | 308370 | ERR | Unable to connect to monitor id 3 for streaming | zm_stream.cpp | 59
2023/05/10-12:27:41 | zms_m3 | 308370 | ERR | Can't open memory map file /dev/shm/zm.mmap.3: No such file or directory | zm_monitor.cpp | 862

Even restarting ZoneMinder does not resolve this issue.

To Reproduce
Steps to reproduce the behavior:

1. Add a new monitor
2. Delete the monitor
3. View the Error Logs

Expected behavior
When a monitor is deleted, the corresponding processes associated to that monitor will also be deleted.

[connortechnology]

I just added some code to sort of deal with this... in terms of sending an instructive jpeg. but if the browser asks for the stream of monitor 3, it is going to log an error. Now... a page refresh should cause the browser to know that the monitor is deleted. So which view is up in your browser trying to view monitor 3?