pluma crashed with SIGSEGV in gtk_tree_model_get_valist()

[Connor Bornak]

Crash occurred after installing and selecting a new color scheme.
Happened immediately after switching color scheme unlike Bug #1723559 which is why I am reporting a new bug. Using Ubuntu MATE 21.10

ProblemType: Crash
DistroRelease: Ubuntu 21.10
Package: pluma 1.26.0-0ubuntu1
ProcVersionSignature: Ubuntu 5.13.0-16.16-generic 5.13.13
Uname: Linux 5.13.0-16-generic x86_64
ApportVersion: 2.20.11-0ubuntu69
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: MATE
Date: Tue Sep 28 19:19:11 2021
ExecutablePath: /usr/bin/pluma
InstallationDate: Installed on 2021-09-27 (1 days ago)
InstallationMedia: Ubuntu-MATE 21.10 "Impish Indri" - Beta amd64 (20210923)
ProcCmdline: pluma
ProcEnviron:
 LANGUAGE=en_US
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SegvAnalysis:
 Segfault happened at: 0x7f8d32fa2ae2 <gtk_tree_model_get_valist+274>: mov 0x30(%rax),%rcx
 PC (0x7f8d32fa2ae2) ok
 source "0x30(%rax)" (0x00000030) not located in a known VMA region (needed readable region)!
 destination "%rcx" ok
SegvReason: reading NULL VMA
Signal: 11
SourcePackage: pluma
StacktraceTop:
 gtk_tree_model_get_valist () from /lib/x86_64-linux-gnu/libgtk-3.so.0
 gtk_tree_model_get () from /lib/x86_64-linux-gnu/libgtk-3.so.0
 ?? ()
 g_closure_invoke () from /lib/x86_64-linux-gnu/libgobject-2.0.so.0
 ?? () from /lib/x86_64-linux-gnu/libgobject-2.0.so.0
Title: pluma crashed with SIGSEGV in gtk_tree_model_get_valist()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin lxd plugdev sambashare sudo
separator:

[Apport retracing service (apport)]

StacktraceTop:
 gtk_tree_model_get_valist (tree_model=tree_model@entry=0x55ab799fa450, iter=iter@entry=0x7fff138af1b0, var_args=var_args@entry=0x7fff138af0b0) at ../../../../gtk/gtktreemodel.c:1812
 gtk_tree_model_get (tree_model=0x55ab799fa450, iter=iter@entry=0x7fff138af1b0) at ../../../../gtk/gtktreemodel.c:1774
 style_scheme_changed (treeview=<optimized out>, dlg=0x55ab799b2420) at dialogs/pluma-preferences-dialog.c:674
 g_closure_invoke (closure=0x55ab799c2960, return_value=0x0, n_param_values=1, param_values=0x7fff138af3a0, invocation_hint=0x7fff138af320) at ../../../gobject/gclosure.c:810
 signal_emit_unlocked_R (node=node@entry=0x55ab7904fe20, detail=detail@entry=0, instance=instance@entry=0x55ab793cd3c0, emission_return=emission_return@entry=0x0, instance_and_params=instance_and_params@entry=0x7fff138af3a0) at ../../../gobject/gsignal.c:3741