I could solve the problem by updating my server’s php-Version to 7!
So, problem solved.
Thanks
The topic is not resolved, but as I wrote in the reply before, I changed the PlugIn. Sorry
I don’t know, in which part of the PlugIn, the error ocoured. I just wanted to update and during that process, or at the end of it, I got the error message.
Maybe the plugin is interfering with other plugins. I now installed another, lighter googlemaps plugin. No problem anymore.
THanks anyway,
Stefan