diff --git a/src/openrct2-ui/input/MouseInput.cpp b/src/openrct2-ui/input/MouseInput.cpp
index 05d9a93f63..56b571cfcc 100644
--- a/src/openrct2-ui/input/MouseInput.cpp
+++ b/src/openrct2-ui/input/MouseInput.cpp
@@ -1392,7 +1392,7 @@ namespace OpenRCT2
 
                             if (dropdown_index == -1)
                             {
-                                if (!gDropdown.items[gDropdown.defaultIndex].isDisabled())
+                                if (gDropdown.defaultIndex != -1 && !gDropdown.items[gDropdown.defaultIndex].isDisabled())
                                 {
                                     dropdown_index = gDropdown.defaultIndex;
                                 }