minibuffer already active

[address@hidden]

Hello Colleagues,

seems that i have the ancient emacs problem :

sometimes, out of the sudden, emacs is telling me that the "minibuffer
is already active" and no further action is possible. Of course i have
searched already the internet, and, of course i have found the answer
that i have to kill the minibuffer with "^]", but, of course, this
command is not working.

Does anyone knows the answer, i have to exit emacs which looks very
stupid to other colleagues, which are using Microsoft Word and so on.

regards