When i change NLS ora gives "ORA-00979: not a GROUP BY expression" error

Question

My Oracle NLS parameters is:

NLS_SORT = TURKISH
NLS_COMP= BINARY

COLUMNA1=VARCHAR2

query:

  SELECT COLUMNA1,
  (SELECT TABLEB.COLUMB1 FROM TABLEB WHERE TABLEB.COLUMNB2 = TABLEA.COLUMNA1)
  FROM TABLEA GROUP BY TABLEA.COLUMNA1

This query worked and return data.

But when i change

NLS_SORT = TURKISH_AI
NLS_COMP= LINGUISTIC

This query points "= TABLEA.COLUMNA1" and gives "ORA-00979: not a GROUP BY expression" error?

In my project, i have a lot of query like this, and i couldnt change all. And if my query wrong, why run before?

Thanks in advance!