diff --git a/komga-webui/src/components/dialogs/CollectionAddToDialog.vue b/komga-webui/src/components/dialogs/CollectionAddToDialog.vue
index a02c53b9..6ba7f3ac 100644
--- a/komga-webui/src/components/dialogs/CollectionAddToDialog.vue
+++ b/komga-webui/src/components/dialogs/CollectionAddToDialog.vue
@@ -116,7 +116,7 @@ export default Vue.extend({
       else return [this.series.id]
     },
     duplicate(): string {
-      if (this.newCollection !== '' && this.collections.some(e => e.name === this.newCollection)) {
+      if (this.newCollection !== '' && this.collections.some(e => e.name.toLowerCase() === this.newCollection.toLowerCase())) {
         return this.$t('dialog.add_to_collection.field_search_create_error').toString()
       } else return ''
     },
diff --git a/komga-webui/src/components/dialogs/CollectionEditDialog.vue b/komga-webui/src/components/dialogs/CollectionEditDialog.vue
index 486fd854..d2e6c4da 100644
--- a/komga-webui/src/components/dialogs/CollectionEditDialog.vue
+++ b/komga-webui/src/components/dialogs/CollectionEditDialog.vue
@@ -157,7 +157,7 @@ export default Vue.extend({
     },
     getErrorsName(): string {
       if (this.form.name === '') return this.$t('common.required').toString()
-      if (this.form.name !== this.collection.name && this.collections.some(e => e.name === this.form.name)) {
+      if (this.form.name.toLowerCase() !== this.collection.name.toLowerCase() && this.collections.some(e => e.name.toLowerCase() === this.form.name.toLowerCase())) {
         return this.$t('dialog.add_to_collection.field_search_create_error').toString()
       }
       return ''
diff --git a/komga-webui/src/components/dialogs/ReadListAddToDialog.vue b/komga-webui/src/components/dialogs/ReadListAddToDialog.vue
index 3b907b5d..16652a04 100644
--- a/komga-webui/src/components/dialogs/ReadListAddToDialog.vue
+++ b/komga-webui/src/components/dialogs/ReadListAddToDialog.vue
@@ -118,7 +118,7 @@ export default Vue.extend({
       else return [this.books.id]
     },
     duplicate(): string {
-      if (this.newReadList !== '' && this.readLists.some(e => e.name === this.newReadList)) {
+      if (this.newReadList !== '' && this.readLists.some(e => e.name.toLowerCase() === this.newReadList.toLowerCase())) {
         return this.$t('dialog.add_to_readlist.field_search_create_error').toString()
       } else return ''
     },
diff --git a/komga-webui/src/components/dialogs/ReadListEditDialog.vue b/komga-webui/src/components/dialogs/ReadListEditDialog.vue
index 6173af47..b8151c9c 100644
--- a/komga-webui/src/components/dialogs/ReadListEditDialog.vue
+++ b/komga-webui/src/components/dialogs/ReadListEditDialog.vue
@@ -172,7 +172,7 @@ export default Vue.extend({
     },
     getErrorsName(): string {
       if (this.form.name === '') return this.$t('common.required').toString()
-      if (this.form.name !== this.readList.name && this.readLists.some(e => e.name === this.form.name)) {
+      if (this.form.name.toLowerCase() !== this.readList.name.toLowerCase() && this.readLists.some(e => e.name.toLowerCase() === this.form.name.toLowerCase())) {
         return this.$t('dialog.add_to_readlist.field_search_create_error').toString()
       }
       return ''