The error messages "cannot read USER [ ][ ]" or "cannot read MU [ ][ ]" appear on the universe.log

Issue/Introduction:

Error Message :
The errors that appear on the universe.log are:

#####################
|ERROR|X|IO |pid=6444.14380| owls_mu_read | cannot read MU [][], err=[3]
|ERROR|X|IO |pid=6444.14380| o_io_cache_data_provider | Error getting Mu <>: 600
|WARN |X|IO |pid=6444.14380| o_mutz_retrieve_tz_desc | Unable to get MU informations.
#####################

#####################
|ERROR|X|IO |pid=835658.535| owls_user_read | cannot read USER [][ ], err=3
|ERROR|X|IO |pid=835658.535| o_io_cache_data_provider_ | Error getting User <>: 600
|ERROR|X|IO |pid=835658.535| o_io_cache_get | Object not found
#####################

Patch level detected:Dollar Universe 6.5.01
Product Version: Dollar.Universe 6.5.01

Description :In some cross nodes events situations, some error messages "cannot read USER [ ][ ], err=3" appear on the universe.log
Also, whenever you try to display the task list, and one of them has no MU defined, this error message appear on the log: "cannot read MU [][], err=[3] "

Cause:

Cause type:
Defect
Root Cause: N/A

Environment:

OS: All

Resolution:

Update to the fix version listed below or a newer version if available.

Fix Status: Released

Fix Version(s):
Component: Application.Server
Version: Dollar.Universe 6.5.21

Additional Information:

Workaround :
N/A