Error running OpenCV for python (ubuntu 16.04)

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Hello, I am new to opencv and I have ran on an error i cant seem to fin a solution for in the forums so far. I use this guide (http://www.pyimagesearch.com/2016/10/...) to install opencv in a virtualenv running python3.5 and i m getting a strange error when a script is exiting. (I first noticed it when i used exit() running python on the command line after import cv2.) The full error is as follows :

*** Error in `python': free(): invalid pointer: 0x00000000016de060 ***
======= Backtrace: =========
/lib/x86_64-linux-gnu/libc.so.6(+0x777e5)[0x7f292b8cb7e5]
/lib/x86_64-linux-gnu/libc.so.6(+0x8037a)[0x7f292b8d437a]
/lib/x86_64-linux-gnu/libc.so.6(cfree+0x4c)[0x7f292b8d853c]
/usr/lib/x86_64-linux-gnu/libprotobuf.so.9(_ZN6google8protobuf8internal28DestroyDefaultRepeatedFieldsEv+0x1f)[0x7f291b9848af]
/usr/lib/x86_64-linux-gnu/libprotobuf.so.9(_ZN6google8protobuf23ShutdownProtobufLibraryEv+0x8b)[0x7f291b983b3b]
/usr/lib/x86_64-linux-gnu/libmirprotobuf.so.3(+0x233b9)[0x7f2909cc03b9]
/lib64/ld-linux-x86-64.so.2(+0x10de7)[0x7f292be4bde7]
/lib/x86_64-linux-gnu/libc.so.6(+0x39ff8)[0x7f292b88dff8]
/lib/x86_64-linux-gnu/libc.so.6(+0x3a045)[0x7f292b88e045]
python[0x5feb5f]
python[0x5fec4a]
python(PyErr_PrintEx+0x36)[0x5fecb6]
python(PyRun_InteractiveOneObject+0x2ce)[0x4583ea]
python(PyRun_InteractiveLoopFlags+0xe8)[0x458576]
python[0x4585d0]
python[0x4cf26a]
python(main+0xe1)[0x4cfe41]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7f292b874830]
python(_start+0x29)[0x5d5f29]
======= Memory map: ========
00400000-007a8000 r-xp 00000000 08:06 5786258                            /home/youuu/.virtualenvs/CVNEW/bin/python3
009a8000-009aa000 r--p 003a8000 08:06 5786258                            /home/youuu/.virtualenvs/CVNEW/bin/python3
009aa000-00a41000 rw-p 003aa000 08:06 5786258                            /home/youuu/.virtualenvs/CVNEW/bin/python3
00a41000-00a72000 rw-p 00000000 00:00 0 
0159b000-01bdf000 rw-p 00000000 00:00 0                                  [heap]
7f28e8000000-7f28e8021000 rw-p 00000000 00:00 0 
7f28e8021000-7f28ec000000 ---p 00000000 00:00 0 
7f28efca1000-7f28efe22000 rw-p 00000000 00:00 0 
7f28efe22000-7f28efedb000 r-xp 00000000 08:06 6044080                    /home/youuu/.virtualenvs/CVNEW/lib/python3.5/site-packages/numpy/random/mtrand.cpython-35m-x86_64-linux-gnu.so
7f28efedb000-7f28f00db000 ---p 000b9000 08:06 6044080                    /home/youuu/.virtualenvs/CVNEW/lib/python3.5/site-packages/numpy/random/mtrand.cpython-35m-x86_64-linux-gnu.so
7f28f00db000-7f28f0100000 rw-p 000b9000 08:06 6044080                    /home/youuu/.virtualenvs/CVNEW/lib/python3.5/site-packages/numpy/random/mtrand.cpython-35m-x86_64-linux-gnu.so
7f28f0100000-7f28f0142000 rw-p 00000000 00:00 0 
7f28f0142000-7f28f014b000 r-xp 00000000 08:06 6043729                    /home/youuu/.virtualenvs/CVNEW/lib/python3.5/site-packages/numpy/fft/fftpack_lite.cpython-35m-x86_64-linux-gnu.so
7f28f014b000-7f28f034a000 ---p 00009000 08:06 6043729                    /home/youuu/.virtualenvs/CVNEW/lib/python3.5/site-packages/numpy/fft/fftpack_lite.cpython-35m-x86_64-linux-gnu.so
7f28f034a000-7f28f034b000 rw-p 00008000 08:06 6043729                    /home/youuu/.virtualenvs/CVNEW/lib/python3.5/site-packages/numpy/fft/fftpack_lite.cpython-35m-x86_64-linux-gnu.so
7f28f034b000-7f28f03cb000 rw-p 00000000 00:00 0 
7f28f03cb000-7f28f03f4000 r-xp 00000000 08:06 6044061                    /home/youuu/.virtualenvs/CVNEW/lib/python3.5/site-packages/numpy/linalg/_umath_linalg.cpython-35m-x86_64-linux-gnu.so
7f28f03f4000-7f28f05f3000 ---p 00029000 08:06 6044061                    /home/youuu/.virtualenvs/CVNEW/lib/python3.5/site-packages/numpy/linalg/_umath_linalg.cpython-35m-x86_64-linux-gnu.so
7f28f05f3000-7f28f05f5000 rw-p 00028000 08:06 6044061                    /home/youuu/.virtualenvs/CVNEW/lib/python3.5/site-packages/numpy/linalg/_umath_linalg.cpython-35m-x86_64-linux-gnu.so
7f28f05f5000-7f28f05f8000 rw-p 000c6000 08:06 6044061                    /home/youuu/.virtualenvs/CVNEW/lib/python3.5/site-packages/numpy/linalg/_umath_linalg.cpython-35m-x86_64-linux-gnu.so
7f28f05f8000-7f28f05fc000 r-xp 00000000 08:06 6044056                    /home/youuu/.virtualenvs/CVNEW/lib/python3.5/site-packages/numpy/linalg/lapack_lite.cpython-35m-x86_64-linux-gnu.so
7f28f05fc000-7f28f07fc000 ---p 00004000 08:06 6044056                    /home/youuu/.virtualenvs/CVNEW/lib/python3.5/site-packages/numpy/linalg/lapack_lite.cpython-35m-x86_64-linux-gnu ...