Traceback (most recent call last):
  File "/home/vrav/Documents/27RC_bmesh_crash.blend/Text", line 6, in <module>
ReferenceError: BMesh data of type BMesh has been removed
Error: Python script fail, look in the console for now...

Traceback (most recent call last):
  File "/home/vrav/Documents/27RC_bmesh_crash.blend/Text", line 6, in <module>
AttributeError: 'bytes' object has no attribute 'edges'
Error: Python script fail, look in the console for now...

 Blender 2.70 (sub 0), Commit date: 2014-03-05 18:37, Hash 19f7f9a
bpy.ops.object.editmode_toggle()  # Operator
bpy.ops.text.run_script()  # Operator
bpy.ops.text.run_script()  # Operator
Python script fail, look in the console for now...  # Error
bpy.ops.text.run_script()  # Operator
Python script fail, look in the console for now...  # Error
bpy.ops.object.editmode_toggle()  # Operator
bpy.ops.object.editmode_toggle()  # Operator

 backtrace
./blender() [0xfbe704]
./blender() [0xfbe95a]
/lib/x86_64-linux-gnu/libc.so.6(+0x36ff0) [0x7f971bc53ff0]
./blender(PyObject_Malloc+0x5c) [0x2bec96c]
./blender(_PyObject_New+0xd) [0x2be9bbd]
./blender(BPy_BMEdge_CreatePyObject+0x74) [0x1864db4]
./blender(PyEval_EvalFrameEx+0x327f) [0x2c501ff]
./blender(PyEval_EvalCodeEx+0x83b) [0x2c4ceab]
./blender(PyEval_EvalCode+0x3b) [0x2c4cf7b]
./blender() [0x18571aa]
./blender() [0x120757c]
./blender() [0xfda062]
./blender() [0xfda560]
./blender() [0x129cb3a]
./blender() [0x12ac22b]
./blender() [0xfdb8c5]
./blender() [0xfdbbd6]
./blender(wm_event_do_handlers+0x19a) [0xfdbeca]
./blender(WM_main+0x18) [0xfc5fb8]
./blender(main+0x501) [0xfc0f8a]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf5) [0x7f971bc3ede5]
./blender() [0xedace5]

import bmesh, bpy
mesh=bpy.context.object.data

bm = bmesh.from_edit_mesh(mesh)

#sort verts after z coordinate
sort = sorted(bm.verts, key=lambda v: v.co.z)

#select lowest
sort[0].select = True

bmesh.update_edit_mesh(mesh)

bm.free()


'''
This codes works the first time it is run.
Produces an error on subsequent runs.
Then crashes on autocomplete in the console.
'''