diff --git a/src/store.js b/src/store.js
index 38894ee..39f18af 100644
--- a/src/store.js
+++ b/src/store.js
@@ -59,6 +59,10 @@ export const classList = ref({});
 const baseUrl = import.meta.env.VITE_API_ENDPOINT || "/api";
 
 export async function fetchData(days, partial) {
+  if (!timetable.value.data || Object.keys(classList.value).length == 0) {
+    partial = false;
+  }
+
   const steps = 2 * days.length + (partial ? 0 : 2);
   let step = 1;
   loadingFailed.value = false;