QGIS » QGIS Application

I discovered that union crashes when the 2 layers have the same field name and this name takes this form : "fhjkf_x" (where x is a letter).
There is also a problem with a field name that end with a number ("jksjfj_i" where i is a number): union works but the field name in the output layer is truncated.

Here some examples to better understand the problem and 2 test layers:

Example 1:
layer A fields : ID, WIDTH_M
layer B fields : ID, WIDTH_M
Union of A and B crashes

Example 2:
layer A fields : ID, WIDTH
layer B fields : ID, WIDTH
Union of A and B OK.
Union layer fields : ID, WIDTH, ID_2, WIDTH_2

Example 3:
layer A fields : ID, WIDTH_ME
layer B fields : ID, WIDTH_ME
Union of A and B OK
Union layer fields : ID, WIDTH_ME, ID_2, WIDTH_ME_2

Example 4:
layer A fields : ID, WIDTH_1
layer B fields : ID, WIDTH_1
Union of A and B OK
But union layer fields : ID, WIDTH_1, ID_2, 12