diff --git a/frontend/src/components/unification/free_lu/FreeLuEdit.vue b/frontend/src/components/unification/free_lu/FreeLuEdit.vue
index 3ee5dd6b06b16bc337cd1acd7cbce0ea86721e62..b9b4d2d807651d140d7449b88c08f1f8ade75d06 100644
--- a/frontend/src/components/unification/free_lu/FreeLuEdit.vue
+++ b/frontend/src/components/unification/free_lu/FreeLuEdit.vue
@@ -153,14 +153,19 @@
             },
             connect_lus_to_slowal_frame(frame_in_progress) {
                 const frame_in_progress_lus = frame_in_progress ? frames2lexical_units([frame_in_progress]).map(l => {
-                    l.pk = l.id;
-                    l.display = l.str;
+                    l.id = l.id;
+                    l.str = l.str;
                     return l;
                 }) : [];
-                const frame_in_progress_lus_ids = new Set(frame_in_progress_lus.map(l => l.pk));
+                const free_lus = this.free_lexical_units.map(l => {
+                    l.id = l.pk;
+                    l.str = l.display;
+                    return l;
+                });
+                const frame_in_progress_lus_ids = new Set(frame_in_progress_lus.map(l => l.id));
                 const lusSelect = function () {
-                    return this.lexical_units.concat(this.free_lexical_units).concat(frame_in_progress_lus).map(lu => {
-                        return `<label><input type="checkbox" ${frame_in_progress_lus_ids.has(lu.pk) ? 'checked' : ''} name="lus" value="${lu.pk}" /> ${lu.display}</label><br />`;
+                    return free_lus.concat(frame_in_progress_lus).map(lu => {
+                        return `<label><input type="checkbox" ${frame_in_progress_lus_ids.has(lu.id) ? 'checked' : ''} name="lus" value="${lu.id}" /> ${lu.str}</label><br />`;
                     }).join("");
                 }.bind(this);
 
@@ -207,7 +212,7 @@
             },
             attach_examples() {
                 if (this.frame_in_progress) {
-                    if (this.selectedLus) {
+                    if (this.selectedLus && this.selectedLus.length > 0) {
                         const examplesSelect = function () {
                             return '<div class="attach-examples-table-wrapper-scroll-y attach-examples-custom-scrollbar"><table id="attach-examples" class="table table-bordered table-striped mb-0"><thead><tr class="font-weight-bold"><th></th><th>Zdanie</th><th>Źródło</th><th>Opinia</th></tr></thead>' + this.examples.map(example => {
                                 return `<tr><td><input type="checkbox" ${this.selectedLus && example.lu_ids.includes(this.selectedLus[0].id)  ? 'checked' : ''} name="lus" value="${example.id}" /></td><td>${example.sentence}</td><td>${example.source}</td><td>${example.opinion}</td></tr>`;