Custom Dimensions dont find database table

Hello together,

when i want to access some dimension in matomo v3.9.1 (Plugin: custom dimensions v3.0.2) i get following error message:

SQLSTATE[45S22]: Column not found: 1054 Unknown column ‘log_link_visit_action.custom_dimension_2’ in ‘where clause’

I have look at my database i have only tables with prefix ‘piwik_’ , i dont know why but the plugin dont recognize the tables_prefix entry in config.ini and tries to access the database table without prefix.

Other matomo functions are working without problems, i hope you can help me!