Output of Tests is doubled

I am using PyCharm 5.0.4.

Whenever I run python unit tests all the output on the console is printed twice.

E. g.

Error
Traceback (most recent call last):
  File "~Python35\lib\unittest\case.py", line 58, in testPartExecutor
    yield
  File "~Python\Python35\lib\unittest\case.py", line 597, in run
    testMethod()

And the rest of the stacktrace

-------------------- >> begin captured stdout << ---------------------

...Some print outputs

--------------------- >> end captured stdout << ----------------------

Error
Traceback (most recent call last):
  File "~Python\Python35\lib\unittest\case.py", line 58, in testPartExecutor
    yield
  File "~Python\Python35\lib\unittest\case.py", line 597, in run
    testMethod()

And the rest of the stacktrace

-------------------- >> begin captured stdout << ---------------------

...Some print outputs

--------------------- >> end captured stdout << ----------------------

This is highly annoying and I would like it to stop.