diff --git a/assess_userscript.js b/assess_userscript.js
index 7cf7d1d7ae970935531088a4306133803db9f58f..42a36f2f363c1979c88b42c481711e6e9df06705 100644
--- a/assess_userscript.js
+++ b/assess_userscript.js
@@ -71,12 +71,25 @@ function timeSlotDiff(s, e) {
 function run()
 {
     const prioTable = document.getElementsByTagName('table')[0];
+    const prioTableBody = prioTable.getElementsByTagName('tbody')[0];
+
+    if (!prioTableBody.innerText.includes("# Plätze")) {
+        // no parsable table
+        return;
+    }
+
+    const flexWrapper = document.createElement("div");
+    flexWrapper.style = "display: flex; flex-wrap: wrap;";
+    prioTable.parentElement.insertBefore(flexWrapper, prioTable)
+    flexWrapper.appendChild(prioTable);
     prioTable.insertAdjacentHTML('afterend', timetable);
 
-    const trs = prioTable.getElementsByTagName('tr');
+    const tableRows = prioTableBody.getElementsByTagName('tr');
     const timeslots = []
-    for (let i = 1; i+1 < trs.length; i++) {
-        let row = trs[i].getElementsByTagName('td');
+
+
+    for (let i = 1; i+1 < tableRows.length; i++) {
+        let row = tableRows[i].getElementsByTagName('td');
 
         // get time info
         let timeStr = row[0].textContent;
@@ -84,20 +97,24 @@ function run()
         const endNum = parseInt(timeStr.substr(14,2)+ timeStr.substr(17,2))
         const slotLen = timeSlotDiff(startNum, endNum)
         const slotStartId = timeStr.substr(1,2).toLowerCase()+'_'+ startNum
+        const isFull = tableRows[i].innerText.includes("VOLL")
 
         // get prio info
-        const rankElem = row[row.length-1].getElementsByTagName('div')[0].getElementsByTagName('div')[2]
+        const rankText = row[row.length-1]?.getElementsByTagName('div')?.[0]?.getElementsByTagName('div')?.[2]?.textContent ?? ""
 
         try {
-        // enter into timetable
-        const slotElem = document.getElementById(slotStartId)
-        slotElem.setAttribute("rowspan", slotLen)
-        slotElem.innerHTML = rankElem.textContent + '<br>' + row[row.length-3].textContent
-
+            // enter into timetable
+            const slotElem = document.getElementById(slotStartId)
+            slotElem.setAttribute("rowspan", slotLen)
+            slotElem.innerHTML = rankText + '<br>' + row[row.length-3].textContent
 
-        slotElem.setAttribute("style","background-color: #726a6a;")
+            if (isFull) {
+                slotElem.setAttribute("style","background-color: #FFCCCC;")
+            } else {
+                slotElem.setAttribute("style","background-color: #726a6a;")
+            }
 
-        console.log(slotStartId + ' -> '+slotLen)
+            console.log(slotStartId + ' -> '+slotLen)
         } catch (e) {console.error(e)}
     }