Node.js serveraction "Cannot read property 'get' of undefined"

My “post” server-actions in an existing project (tested it also with a new one, same problem here) are all failing with the following error message.
All “get” server-actions are okay.
Is this a wappler-thing or are my server or docker settings wrong? After hours of test it with a new project, reinstall wappler and setup a full new docker image etc. i’m at the end with my knowledge

Thanks for your response.
Greetings from switzerland

{status: “500”, message: “Cannot read property ‘get’ of undefined”,…}

message: “Cannot read property ‘get’ of undefined”
stack: “TypeError: Cannot read property ‘get’ of undefined↵ at value (/opt/node_app/lib/core/parser.js:605:51)↵ at /opt/node_app/lib/core/parser.js:685:21↵ at parser (/opt/node_app/lib/core/parser.js:351:19)↵ at Object.parseValue (/opt/node_app/lib/core/parser.js:716:24)↵ at /opt/node_app/lib/core/app.js:295:37↵ at Array.filter ()↵ at /opt/node_app/lib/core/app.js:293:39↵ at Array.forEach ()↵ at App.parseSQL (/opt/node_app/lib/core/app.js:291:30)↵ at App.insert (/opt/node_app/lib/modules/dbupdater.js:5:26)”

status: “500”