Debug commands bring openGL problem?

can you see the errors that "g_showEntityInfo" brings when ingame?

> caught OpenGL error: GL_INVALID_OPERATION in file /home/biel/src/OpenTechBFG/neo/renderer/RenderSystem.cpp line 838

I think it's related to the drawing of debug lines, I get the same error when calling r_showPortals.
but at the same time r_showTris does work without any of these issues.