Q:

QGIS 2.12.3 Crashes on buffering line vectors

I'm using QGIS 2.12.3 and I'm trying to create a buffer of 100 mt around a line vector using the Vector - Geoprocessing Buffer tool, but qgis crashes at every try. I've already checked that the RS of the vector is the same of the project.
Can anybody give some hint to solve this problem and create the buffer?

A:

QGIS has issues with geographic coordinates, you should use Save As and pick a projected CRS such as 27700 british national grid. If that didn't solve it then...
I just had the same problem with a "bad" line vector layer. Hope it's not too late but after trying several workarounds, what I've done was using the MMQGIS plugin > modify > convert geometry type. The resulting layer was perfectly fine

