diff --git a/src/lua_script.c b/src/lua_script.c
index 9d1eb8918..5f2aab088 100644
--- a/src/lua_script.c
+++ b/src/lua_script.c
@@ -395,6 +395,7 @@ void LUA_InvalidateLevel(void)
 {
 	thinker_t *th;
 	size_t i;
+	ffloor_t *rover = NULL;
 	if (!gL)
 		return;
 
@@ -406,7 +407,15 @@ void LUA_InvalidateLevel(void)
 	for (i = 0; i < numsubsectors; i++)
 		LUA_InvalidateUserdata(&subsectors[i]);
 	for (i = 0; i < numsectors; i++)
+	{
 		LUA_InvalidateUserdata(&sectors[i]);
+		LUA_InvalidateUserdata(sectors[i].lines);
+		if (sectors[i].ffloors)
+		{
+			for (rover = sectors[i].ffloors; rover; rover = rover->next)
+				LUA_InvalidateUserdata(rover);
+		}
+	}
 	for (i = 0; i < numlines; i++)
 	{
 		LUA_InvalidateUserdata(&lines[i]);