diff --git a/src/misc_gui.cpp b/src/misc_gui.cpp
--- a/src/misc_gui.cpp
+++ b/src/misc_gui.cpp
@@ -782,7 +782,7 @@ void GuiShowTooltips(Window *parent, Str
 {
 	DeleteWindowById(WC_TOOLTIPS, 0);
 
-	if (str == STR_NULL) return;
+	if (str == STR_NULL || !_cursor.in_window) return;
 
 	new TooltipsWindow(parent, str, paramcount, params, close_tooltip);
 }