Vivado 2017.3: Script abort with error "design with the name ... already exists"

[Martin20179]

Since Xilinx Vivado Version 2017.3 I get the following error message during checkout:

INFO: [BD_TCL-3] Currently there is no design <zusys> in project, so creating one...
ERROR: [BD 5-137] A design with the name zusys already exists.
ERROR: [Common 17-39] 'create_bd_design' failed due to earlier errors.

    while executing
"create_bd_design $design_name"
    (procedure "cr_bd_zusys" line 8)
    invoked from within
"cr_bd_zusys """
    (file "sources/myproject.tcl" line 1721)
INFO: [Common 17-206] Exiting Vivado at Mon Oct 23 14:08:46 2017...
~~~
~~~ Finished processing project myproject


~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
~~~ MESSAGES FOR PROJECT myproject
~~~
~~~ CRITICAL ERROR: Vivado exited with an unexpected status code after project regeneration: 1.  Aborting.  The project has NOT necessarily been safely or fully created!
~~~

I can't locate the error. Maybe it is also a Vivado bug...