diff --git a/api/endpoints.go b/api/endpoints.go
index ce17889..58b4e13 100644
--- a/api/endpoints.go
+++ b/api/endpoints.go
@@ -191,8 +191,14 @@ func (s *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 		case "/savedata/delete":
 			err = savedata.Delete(uuid, datatype, slot)
 		case "/savedata/clear":
+			s, ok := save.(defs.SessionSaveData)
+			if !ok {
+				httpError(w, r, fmt.Errorf("save data is not type SessionSaveData"), http.StatusBadRequest)
+				return
+			}
+
 			// doesn't return a save, but it works
-			save, err = savedata.Clear(uuid, slot, daily.Seed(), save.(defs.SessionSaveData))
+			save, err = savedata.Clear(uuid, slot, daily.Seed(), s)
 		}
 		if err != nil {
 			httpError(w, r, err, http.StatusInternalServerError)