Memary malloc error of variable "m_sub_distances" in task "approx_with_id"

[QDXG-CXK]

Failure occurs when I executing command "./deltapq -dataset sift1m_withId/ -ext fvecs -task approx_with_id -m 8 -k 256 -h 1 -diff 8 -N 1000000". Below are error message:
"
In function edges_to_tree_index_approx() :
m_sub_distances is NULL
"

[QDXG-CXK]

It can be fixed by copying the codes of memory malloc for m_sub_distances in deltapq_qpprox_tree_main.cpp at 127~131 to line 249.