diff --git a/frontend/pages/createDocument/edit/[[id]].vue b/frontend/pages/createDocument/edit/[[id]].vue
index e91e09a..c207c38 100644
--- a/frontend/pages/createDocument/edit/[[id]].vue
+++ b/frontend/pages/createDocument/edit/[[id]].vue
@@ -12,6 +12,7 @@ const route = useRoute()
 const router = useRouter()
 const modal = useModal()
 const auth = useAuthStore()
+const toast = useToast()
 const quoteLikeDocumentTypes = ["quotes", "costEstimates"]
 const deliveryNoteLikeDocumentTypes = ["deliveryNotes", "packingSlips"]
 const documentStorageFallbackTypes = {
@@ -114,6 +115,18 @@ const serialIntervalItems = ['wöchentlich', '2 - wöchentlich', 'monatlich', 'v
 const serialDateDirectionItems = ['Rückwirkend', 'Im Voraus']
 const taxPercentItems = [19, 7, 0]
 const selectedCustomer = computed(() => customers.value.find(i => i.id === itemInfo.value.customer) || null)
+const findById = (items, id) => {
+  if (id === null || typeof id === "undefined") return null
+
+  return items.find((item) => item.id === id) || null
+}
+const getContactName = (id) => findById(contacts.value, id)?.fullName || "Kontakt nicht gefunden"
+const getContractName = (id) => findById(contracts.value, id)?.name || "Vertrag nicht gefunden"
+const getContractNumber = (id) => findById(contracts.value, id)?.contractNumber || "Vertrag nicht gefunden"
+const getLetterheadName = (id) => findById(letterheads.value, id)?.name || "Briefpapier nicht gefunden"
+const getPlantName = (id) => findById(plants.value, id)?.name || "Objekt nicht gefunden"
+const getProjectName = (id) => findById(projects.value, id)?.name || "Projekt nicht gefunden"
+const getSelectedLetterhead = () => findById(letterheads.value, itemInfo.value.letterhead)
 const normalizeExternalUrl = (value) => {
   if (!value || typeof value !== "string") return null
 
@@ -195,7 +208,11 @@ watch(() => itemInfo.value.deliveryDateType, () => {
 })
 
 const setupData = async () => {
-  letterheads.value = (await useEntities("letterheads").select("*")).filter(i => i.documentTypes.length === 0 || i.documentTypes.includes(itemInfo.value.type))
+  letterheads.value = (await useEntities("letterheads").select("*")).filter(i => {
+    const documentTypes = Array.isArray(i.documentTypes) ? i.documentTypes : []
+
+    return documentTypes.length === 0 || documentTypes.includes(itemInfo.value.type)
+  })
   createddocuments.value = await useEntities("createddocuments").select("*")
   projects.value = await useEntities("projects").select("*")
   plants.value = await useEntities("plants").select("*")
@@ -647,7 +664,9 @@ const setDocumentTypeConfig = (withTexts = false) => {
     //itemInfo.value.endText = texttemplates.value.find(i => i.documentType === itemInfo.value.type && i.default && i.pos === "endText").text
   }
 
-  itemInfo.value.letterhead = letterheads.value[0].id
+  if (!getSelectedLetterhead()) {
+    itemInfo.value.letterhead = letterheads.value[0]?.id || null
+  }
 
   if (itemInfo.value.type === "advanceInvoices" && !itemInfo.value.rows.find(i => i.text === "Abschlagszahlung")) {
 
@@ -1431,15 +1450,15 @@ const getDocumentData = async () => {
       }] : [],
       ...itemInfo.value.plant ? [{
         label: "Objekt",
-        content: plants.value.find(i => i.id === itemInfo.value.plant).name,
+        content: getPlantName(itemInfo.value.plant),
       }] : [],
       ...itemInfo.value.project ? [{
         label: "Projekt",
-        content: projects.value.find(i => i.id === itemInfo.value.project).name
+        content: getProjectName(itemInfo.value.project)
       }] : [],
       ...itemInfo.value.contract ? [{
         label: "Vertrag",
-        content: contracts.value.find(i => i.id === itemInfo.value.contract).contractNumber
+        content: getContractNumber(itemInfo.value.contract)
       }] : []
     ],
     title: itemInfo.value.title,
@@ -1494,7 +1513,14 @@ const showDocument = ref(false)
 const uri = ref("")
 const generateDocument = async () => {
   showDocument.value = false
-  const path = letterheads.value.find(i => i.id === itemInfo.value.letterhead).path
+  const selectedLetterhead = getSelectedLetterhead()
+
+  if (!selectedLetterhead?.path) {
+    toast.add({ title: "Briefpapier fehlt", color: "error" })
+    return
+  }
+
+  const path = selectedLetterhead.path
 
   uri.value = await useFunctions().useCreatePDF(await getDocumentData(), path, "createdDocument")
   /*uri.value = await useNuxtApp().$api("/api/functions/createinvoicepdf",{
@@ -1984,7 +2010,7 @@ const setRowData = async (row, service = {sellingPriceComposed: {}}, product = {
                     :color="itemInfo.letterhead ? 'primary' : 'error'"
                 >
                   <template #default>
-                    {{ itemInfo.letterhead ? letterheads.find(i => i.id === itemInfo.letterhead).name : "Kein Briefpapier gewählt" }}
+                    {{ itemInfo.letterhead ? getLetterheadName(itemInfo.letterhead) : "Kein Briefpapier gewählt" }}
                   </template>
                 </USelectMenu>
               </UFormField>
@@ -2077,7 +2103,7 @@ const setRowData = async (row, service = {sellingPriceComposed: {}}, product = {
               </UFormField>
               <UFormField
                   label="Ansprechpartner:"
-                  v-if="itemInfo.customer ? customers.find(i => i.id === itemInfo.customer).isCompany : false "
+                  v-if="selectedCustomer?.isCompany"
               >
                 <InputGroup>
                   <USelectMenu
@@ -2093,7 +2119,7 @@ const setRowData = async (row, service = {sellingPriceComposed: {}}, product = {
                   >
                     <template #default>
                       <span
-                          class="truncate">{{ itemInfo.contact ? contacts.find(i => i.id === itemInfo.contact).fullName : "Kein Kontakt ausgewählt" }}</span>
+                          class="truncate">{{ itemInfo.contact ? getContactName(itemInfo.contact) : "Kein Kontakt ausgewählt" }}</span>
                     </template>
                   </USelectMenu>
                   <!--                  <UButton
@@ -2124,14 +2150,14 @@ const setRowData = async (row, service = {sellingPriceComposed: {}}, product = {
               >
                 <UInput
                     v-model="itemInfo.address.street"
-                    :placeholder="itemInfo.customer ? customers.find(i => i.id === itemInfo.customer).infoData.street : 'Straße + Hausnummer'"
+                    :placeholder="selectedCustomer?.infoData?.street || 'Straße + Hausnummer'"
                     :color="itemInfo.address.street ? 'primary' : 'error'"
                     class="w-full"
                 />
                 <UInput
                     v-model="itemInfo.address.special"
                     class="mt-3 w-full"
-                    :placeholder="itemInfo.customer ? customers.find(i => i.id === itemInfo.customer).infoData.special : 'Adresszusatz'"
+                    :placeholder="selectedCustomer?.infoData?.special || 'Adresszusatz'"
                 />
                 <InputGroup class="mt-3 w-full">
                   <UInput
@@ -2142,13 +2168,13 @@ const setRowData = async (row, service = {sellingPriceComposed: {}}, product = {
                       maxlength="5"
                       @input="sanitizeAddressZipInput"
                       @change="checkAddressZip"
-                      :placeholder="itemInfo.customer ? customers.find(i => i.id === itemInfo.customer).infoData.zip : 'PLZ'"
+                      :placeholder="selectedCustomer?.infoData?.zip || 'PLZ'"
                       :color="itemInfo.address.zip ? 'primary' : 'error'"
                   />
                   <UInput
                       class="w-full min-w-0"
                       v-model="itemInfo.address.city"
-                      :placeholder="itemInfo.customer ? customers.find(i => i.id === itemInfo.customer).infoData.city : 'Ort'"
+                      :placeholder="selectedCustomer?.infoData?.city || 'Ort'"
                       :color="itemInfo.address.city ? 'primary' : 'error'"
                   />
                 </InputGroup>
@@ -2422,7 +2448,7 @@ const setRowData = async (row, service = {sellingPriceComposed: {}}, product = {
                       :disabled="!itemInfo.customer"
                   >
                     <template #default>
-                      {{ plants.find(i => i.id === itemInfo.plant) ? plants.find(i => i.id === itemInfo.plant).name : "Kein Objekt ausgewählt" }}
+                      {{ itemInfo.plant ? getPlantName(itemInfo.plant) : "Kein Objekt ausgewählt" }}
                     </template>
                     <template #item="{ item: plant }">
                       {{ plant.name }}
@@ -2459,7 +2485,7 @@ const setRowData = async (row, service = {sellingPriceComposed: {}}, product = {
                       :disabled="!itemInfo.customer"
                   >
                     <template #default>
-                      {{ itemInfo.project ? projects.find(i => i.id === itemInfo.project).name : "Kein Projekt ausgewählt" }}
+                      {{ itemInfo.project ? getProjectName(itemInfo.project) : "Kein Projekt ausgewählt" }}
                     </template>
                     <template #item="{ item: project }">
                       {{ customers.find(i => i.id === project.customer) ? customers.find(i => i.id === project.customer).name : "" }}
@@ -2497,7 +2523,7 @@ const setRowData = async (row, service = {sellingPriceComposed: {}}, product = {
                       :disabled="!itemInfo.customer"
                   >
                     <template #default>
-                      {{ itemInfo.contract ? contracts.find(i => i.id === itemInfo.contract).name : "Kein Vertrag ausgewählt" }}
+                      {{ itemInfo.contract ? getContractName(itemInfo.contract) : "Kein Vertrag ausgewählt" }}
                     </template>
                     <template #item="{ item: contract }">
                       {{ customers.find(i => i.id === contract.customer) ? customers.find(i => i.id === contract.customer).name : "" }}