diff --git a/src/openrct2-ui/UiContext.cpp b/src/openrct2-ui/UiContext.cpp
index 001c4b4abc..816904e50a 100644
--- a/src/openrct2-ui/UiContext.cpp
+++ b/src/openrct2-ui/UiContext.cpp
@@ -758,7 +758,7 @@ private:
         resolutions.erase(last, resolutions.end());
 
         // Update config fullscreen resolution if not set
-        if (gConfigGeneral.fullscreen_width == -1 || gConfigGeneral.fullscreen_height == -1)
+        if (!resolutions.empty() && (gConfigGeneral.fullscreen_width == -1 || gConfigGeneral.fullscreen_height == -1))
         {
             gConfigGeneral.fullscreen_width = resolutions.back().Width;
             gConfigGeneral.fullscreen_height = resolutions.back().Height;