Fix #22920: Crash when sacking a staff member

distribution/changelog.txt

@@ -4,6 +4,7 @@
 - Fix: [#22615] Crash when drawing Space Rings with an invalid ride entry.
 - Fix: [#22633] Crash when drawing loading screen with an outdated g2.dat.
 - Fix: [#22918] Zooming with keyboard moves the view off centre.
+- Fix: [#22920] Crash when sacking a staff member.
 - Fix: [#22921] Wooden RollerCoaster flat to steep railings appear in front of track in front of them.
 - Fix: [#22962] Fuzzy horizontal-to-vertical line transitions in charts.
 - Fix: [#23009] Scenarios from RCT Classic (.sea files) are not included in the scenario index.

src/openrct2-ui/windows/StaffFirePrompt.cpp

@@ -78,6 +78,11 @@ namespace OpenRCT2::Ui::Windows
             DrawWidgets(dpi);
 
             Peep* peep = GetEntity<Staff>(EntityId::FromUnderlying(number));
+            // The staff member may have been fired in the meantime.
+            if (peep == nullptr)
+            {
+                return;
+            }
             auto ft = Formatter();
             peep->FormatNameTo(ft);