Fix sitting bug

typeclasses/sittables.py

@@ -37,6 +37,12 @@ class Sittable(Object):
             sitter.msg(f"You are already sitting {adjective} {article} {self.key}.")
             return
 
+        # Clean up an issue that sometimes someone logs off or leaves
+        # a room without standing first.
+        if self.db.sitter:
+            if not self.location.has(self.db.sitter):
+                self.db.sitter = None
+
         if self.db.sitter and not self.multiple:
             sitter.msg(f"You can't sit {adjective} {article} {self.key} "
                        f"- {current.get_display_name(sitter)} is already sitting there!")