#18 Segmentation fault under gdb

[Cucumber]

in file Conventions.cpp::updMainstreamType
this line:
const string& feats = getConfiguration(*it+",features");

while running TranscriberAG under gdb, the above line would cause segmentation fault because the feats is invalid.
but running TranscriberAG from command prompt, it works fine.

how can I fix this.
I am a student studing speech...