Openmotif issue

We have to maintain motif based GUI application longer than 20 years. Current application is compiled with motif 2.3.9 on redhat 6.8 with gcc 4.4.7 with 32 bit option and executable run on Redhat 7.4.

GUI application crashes on Redhat 7 and gives the following error
SEGV_MAPERROR address not mapped to object

Do we have any idea on this issue.