wrote report /var/crash/_usr_lib_speech-dispatcher-modules_sd_espeak-ng.110.crash

Ubuntu MATE 18.04 LTS (Japanese environment)

Turn on the power and display the login screen. Click the doll icon (Accessibility) on the upper right of the screen with the left mouse button.
Turn on "Screen reader" and "On-screen keyboard".

I intentionally made a wrong input with the keyboard on the screen.
Turn off "on-screen keyboard".
I intentionally made a wrong input with the keyboard.
I repeat this several times.

I turned off "screen reader" and "on-screen keyboard".
I logged in.
When Ubuntu MATE Welcome is displayed, an internal error (crash) has been reported.

Trying the same thing, there are times when it does not occur, but sometimes it happens.

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/var/log/apport.log：

ERROR: apport (pid 1244) Sun Apr 29 10:51:44 2018: called for pid 1211, signal 6, core limit 0, dump mode 1
ERROR: apport (pid 1244) Sun Apr 29 10:51:44 2018: executable: /usr/lib/speech-dispatcher-modules/sd_espeak-ng (command line "/usr/lib/speech-dispatcher-modules/sd_espeak-ng /etc/speech-dispatcher/modules/espeak-ng.conf")
ERROR: apport (pid 1244) Sun Apr 29 10:51:44 2018: gdbus call error: Error: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.gnome.SessionManager was not provided by any .service files

ERROR: apport (pid 1244) Sun Apr 29 10:51:44 2018: debug: session gdbus call:
ERROR: apport (pid 1244) Sun Apr 29 10:51:49 2018: wrote report /var/crash/_usr_lib_speech-dispatcher-modules_sd_espeak-ng.110.crash
ERROR: apport (pid 1282) Sun Apr 29 10:52:03 2018: called for pid 1261, signal 6, core limit 0, dump mode 1
ERROR: apport (pid 1282) Sun Apr 29 10:52:03 2018: executable: /usr/lib/speech-dispatcher-modules/sd_espeak-ng (command line "/usr/lib/speech-dispatcher-modules/sd_espeak-ng /etc/speech-dispatcher/modules/espeak-ng.conf")
ERROR: apport (pid 1282) Sun Apr 29 10:52:03 2018: gdbus call error: Error: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.gnome.SessionManager was not provided by any .service files

ERROR: apport (pid 1282) Sun Apr 29 10:52:03 2018: debug: session gdbus call:
ERROR: apport (pid 1282) Sun Apr 29 10:52:03 2018: apport: report /var/crash/_usr_lib_speech-dispatcher-modules_sd_espeak-ng.110.crash already exists and unseen, doing nothing to avoid disk usage DoS
ERROR: apport (pid 1352) Sun Apr 29 10:53:33 2018: called for pid 1329, signal 6, core limit 0, dump mode 1
ERROR: apport (pid 1352) Sun Apr 29 10:53:33 2018: executable: /usr/lib/speech-dispatcher-modules/sd_espeak-ng (command line "/usr/lib/speech-dispatcher-modules/sd_espeak-ng /etc/speech-dispatcher/modules/espeak-ng.conf")
ERROR: apport (pid 1352) Sun Apr 29 10:53:33 2018: gdbus call error: Error: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.gnome.SessionManager was not provided by any .service files

ERROR: apport (pid 1352) Sun Apr 29 10:53:33 2018: debug: session gdbus call:
ERROR: apport (pid 1352) Sun Apr 29 10:53:33 2018: apport: report /var/crash/_usr_lib_speech-dispatcher-modules_sd_espeak-ng.110.crash already exists and unseen, doing nothing to avoid disk usage DoS

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ERROR: apport (pid 5595) Sun Apr 29 12:04:33 2018: called for pid 5567, signal 6, core limit 0, dump mode 1
ERROR: apport (pid 5595) Sun Apr 29 12:04:33 2018: executable: /usr/lib/speech-dispatcher-modules/sd_espeak-ng (command line "/usr/lib/speech-dispatcher-modules/sd_espeak-ng /etc/speech-dispatcher/modules/espeak-ng.conf")
ERROR: apport (pid 5595) Sun Apr 29 12:04:33 2018: gdbus call error: Error: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.gnome.SessionManager was not provided by any .service files

ERROR: apport (pid 5595) Sun Apr 29 12:04:33 2018: debug: session gdbus call:
ERROR: apport (pid 5595) Sun Apr 29 12:04:34 2018: wrote report /var/crash/_usr_lib_speech-dispatcher-modules_sd_espeak-ng.110.crash
ERROR: apport (pid 5635) Sun Apr 29 12:05:07 2018: called for pid 5614, signal 6, core limit 0, dump mode 1
ERROR: apport (pid 5635) Sun Apr 29 12:05:07 2018: executable: /usr/lib/speech-dispatcher-modules/sd_espeak-ng (command line "/usr/lib/speech-dispatcher-modules/sd_espeak-ng /etc/speech-dispatcher/modules/espeak-ng.conf")
ERROR: apport (pid 5635) Sun Apr 29 12:05:07 2018: gdbus call error: Error: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.gnome.SessionManager was not provided by any .service files

ERROR: apport (pid 5635) Sun Apr 29 12:05:07 2018: debug: session gdbus call:
ERROR: apport (pid 5635) Sun Apr 29 12:05:07 2018: apport: report /var/crash/_usr_lib_speech-dispatcher-modules_sd_espeak-ng.110.crash already exists and unseen, doing nothing to avoid disk usage DoS
ERROR: apport (pid 7768) Sun Apr 29 12:10:31 2018: called for pid 7736, signal 6, core limit 0, dump mode 1
ERROR: apport (pid 7768) Sun Apr 29 12:10:31 2018: executable: /usr/lib/speech-dispatcher-modules/sd_espeak-ng (command line "/usr/lib/speech-dispatcher-modules/sd_espeak-ng /etc/speech-dispatcher/modules/espeak-ng.conf")
ERROR: apport (pid 7768) Sun Apr 29 12:10:31 2018: gdbus call error: Error: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.gnome.SessionManager was not provided by any .service files

ERROR: apport (pid 7768) Sun Apr 29 12:10:31 2018: debug: session gdbus call:
ERROR: apport (pid 7768) Sun Apr 29 12:10:31 2018: this executable already crashed 2 times, ignoring