Error when invoking the plugin

[nikaiw]

Todo:
Failed while executing plugin_t.run():
can only concatenate str (not "NoneType") to str
File "/home/user/.idapro/plugins/AutoResolv.py", line 207, in run
self.main()
File "/home/user/.idapro/plugins/AutoResolv.py", line 162, in main
db_path = module_path + ".cache_" + binary_name + ".db"