** Describe the bug **
When trying to perform a scan or any action on nmap, it displays the message: "Version: 7.91
Traceback (most recent call last):
File "zenmapGUI \ ScanInterface.pyo", line 389, in start_scan_cb
File "zenmapGUI \ ScanInterface.pyo", line 516, in execute_command
TypeError: coercing to Unicode: need string or buffer, exceptions.KeyError found

When closing the message, the program is also closed

Reproduce
-Open the program
-Insert Target
-Choose the profile
-Click on Scan

Expected behavior
Features: Version: 7.91
Traceback (most recent call last):
File "zenmapGUI \ ScanInterface.pyo", line 389, in start_scan_cb
File "zenmapGUI \ ScanInterface.pyo", line 516, in execute_command
TypeError: coercing to Unicode: need string or buffer, exceptions.KeyError found

** Version information (please complete the following information): **

• SO: Windous 7
  -Nmap 7.91

** Additional context **
It also doesn't work on command.