Using Squeeze 0.2.3

Issue:
Squeeze segfaults if you attempt to extract the "go up directory" (shown as .. ).

Steps to reproduce:
1. Open Squeeze
2. Open an existing archive that has multiple levels of folders in the archive
3. In the Squeeze interface, navigate to a lower level folder, e.g. folder level two or three
4. Select (single-click) "go up directory" icon, shown as an up arrow icon and ..
5. Go to Actions --> Extract
6. Squeeze then segfaults.

Expected results:
Extract should either be disabled when "go up directory" is selected, or Squeeze should give an error message saying that the file could not be extracted.

dmesg log:
squeeze[5012]: segfault at c ip b7f0c34a sp bfb41380 error 4 in libsqueeze-0.2.so.0.0.2[b7f05000+f000]