Do you use mods? UCP? creative?
More information are helpful...

Ok, sorry ;-)

I am using this mod together with the Unofficial Code Patch Steam Workshop

and 5X UCP Compatibility Mod (5XCPC).

i always used this 3 mods together and had never problems.

This problem appeared for the first time. In my actual game, i created an own race (basic human). This race genetic was set creative.

Woah. Your problem description went from no information to all information.

You didnt install the unofficial code patch. you just subscribed. Read the description what you need to do.
The bug you found got already fixed. It happens when you somehow get all choice techs in a node and there are others. With a creative race you will not be able to unlock those.

Thanks for your answer. If this bug is fixed already, how can i be sure that this bug won't appear again? Was there another update? An update i didn't noticed?
Or does the fix come with the correct installation of the unofficial code patch?
So right now, after installing the patch i've got two mods running with the same content:
1 = unofficial code patch
2 = unofficial code patch Steam Workshop

both are activated, ok?

@proxomat: Yes having both active is correct.