Thank you very much for the immediate action.
In my case the problem triggered while i use paypal as a second option. The plugin converted the amount twice (1. when page loads 2. when i select paypal as payment option) and resulted into a 4 digit decimal.
After some tweaking i got a solution by checking off line 189 in plugin.php
//add_filter( 'woocommerce_paypal_args', 'woocurrenciez_paypal_convert_arguments' );
Thanks and regards
Sans