Fix #17553: Crash when moving invention list items to empty list (#17555)

* Fix content check

* Add change log entry

Co-authored-by: Duncan <duncans_pumpkin@hotmail.co.uk>

contributors.md

@@ -194,6 +194,7 @@ The following people are not part of the development team, but have been contrib
 * Erik Wouters (EWouters)
 * Hoby R. (hobyr)
 * Huu Kim Nguyen (CoderUndefined)
+* Henry Cheng (jazzysoggy)
 
 ## Toolchain
 * (Balletie) - macOS

distribution/changelog.txt

@@ -7,6 +7,7 @@
 - Fix: [#16476] The game sometimes crashes when demolishing a maze.
 - Fix: [#17444] “Manta Ray” boats slowed down too much in “Ayers Rock” scenario (original bug).
 - Fix: [#17503] Parks with staff with an ID of 0 have all staff windows focus on that staff
+- Fix: [#17553] Crash when moving invention list items to empty list
 
 0.4.1 (2022-07-04)
 ------------------------------------------------------------------------

src/openrct2-ui/windows/EditorInventionsList.cpp

@@ -618,7 +618,7 @@ public:
         {
             res = inventionListWindow->GetResearchItemAt(newScreenCoords);
             newScreenCoords.y += LIST_ROW_HEIGHT;
-        } while (res.has_value() && res->research->IsAlwaysResearched());
+        } while (res.has_value() && res->research != nullptr && res->research->IsAlwaysResearched());
 
         if (res.has_value())
         {