crash on opening of the multidimensional trace

When trying to open the multidimensional view (either when an execution is started or when windows -> show view, the JVM is crashing:
```
#
# A fatal error has been detected by the Java Runtime Environment:
#
# SIGSEGV (0xb) at pc=0x00007fafca80476e, pid=8566, tid=0x00007fb0b00dc700
#
# JRE version: Java(TM) SE Runtime Environment (8.0_162-b12) (build 1.8.0_162-b12)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (25.162-b12 mixed mode linux-amd64 compressed oops)
# Problematic frame:
# C [libgdk-x11-2.0.so.0+0x4f76e] gdk_display_open+0x4e
#
# Core dump written. Default location: /home/jdeanton/install/gemoc/Oxygen/build_90/gemoc_studio-linux.gtk.x86_64/core or core.8566
#
# An error report file with more information is saved as:
# /home/jdeanton/install/gemoc/Oxygen/build_90/gemoc_studio-linux.gtk.x86_64/hs_err_pid8566.log
#
# If you would like to submit a bug report, please visit:
# http://bugreport.java.com/bugreport/crash.jsp
# The crash happened outside the Java Virtual Machine in native code.
# See problematic frame for where to report the bug.
#
```
I'm not sure if reproducible on another machine.

Here is my JVM configuration: vm_info: Java HotSpot(TM) 64-Bit Server VM (25.162-b12) for linux-amd64 JRE (1.8.0_162-b12), built on Dec 19 2017 21:15:48 by "java_re" with gcc 4.3.0 20080428 (Red Hat 4.3.0-8)