diff --git a/.env b/.env
deleted file mode 100644
index 969c026..0000000
--- a/.env
+++ /dev/null
@@ -1,4 +0,0 @@
-#NODE_ENV=production
-NODE_ENV=development
-
-VUE_APP_PORTAL=//data.geologie.ac.at
\ No newline at end of file
diff --git a/src/views/dataset-detail.component.ts/dataset-detail.component.vue b/src/views/dataset-detail.component.ts/dataset-detail.component.vue
index 035c9a9..2f0372a 100644
--- a/src/views/dataset-detail.component.ts/dataset-detail.component.vue
+++ b/src/views/dataset-detail.component.ts/dataset-detail.component.vue
@@ -56,7 +56,9 @@
                         <div class="column">
                             <label class="label">
                                 {{ getCitation() }}
-                                <a class="link-label" v-bind:href="'https://doi.org/' + dataset.identifier.value">({{ "https://doi.org/" + dataset.identifier.value }})</a>
+                                <a v-if="dataset.identifier" class="link-label" v-bind:href="'https://doi.org/' + dataset.identifier.value"
+                                    >({{ "https://doi.org/" + dataset.identifier.value }})</a
+                                >
                             </label>
                         </div>
                     </div>