diff --git a/app/src/api/errors.js b/app/src/api/errors.js
index f120ac02..e8648d3a 100644
--- a/app/src/api/errors.js
+++ b/app/src/api/errors.js
@@ -7,8 +7,8 @@ import i18n from '@/i18n'
 
 
 class APIError extends Error {
-  constructor (request, { url, status, statusText }, errorData) {
-    super(errorData.error || i18n.t('error_server_unexpected'))
+  constructor (request, { url, status, statusText }, { error }) {
+    super(error ? error.replace('\n', '<br>') : i18n.t('error_server_unexpected'))
     const urlObj = new URL(url)
     this.name = 'APIError'
     this.code = status
diff --git a/app/src/api/handlers.js b/app/src/api/handlers.js
index 259e5d2d..123797da 100644
--- a/app/src/api/handlers.js
+++ b/app/src/api/handlers.js
@@ -59,7 +59,7 @@ export async function handleError (request, response, errorData) {
   let errorCode = response.status in errors ? response.status : undefined
   if (typeof errorData === 'string') {
     // FIXME API: Patching errors that are plain text or html.
-    errorData = { error: errorData.replace('\n', '<br>') }
+    errorData = { error: errorData }
   }
   if ('log_ref' in errorData) {
     // Define a special error so it won't get caught as a `APIBadRequestError`.
diff --git a/app/src/views/tool/ToolMigrations.vue b/app/src/views/tool/ToolMigrations.vue
index 400b3627..823490dc 100644
--- a/app/src/views/tool/ToolMigrations.vue
+++ b/app/src/views/tool/ToolMigrations.vue
@@ -121,7 +121,7 @@ export default {
       }
       // Check that every migration's disclaimer has been checked.
       if (Object.values(this.checked).every(value => value === true)) {
-        api.post('migrations/run', { accept_disclaimer: true }).then(() => {
+        api.post('migrations/run?accept_disclaimer').then(() => {
           this.$refs.view.fetchQueries()
         })
       }
@@ -131,7 +131,7 @@ export default {
       const confirmed = await this.$askConfirmation(this.$i18n.t('confirm_migrations_skip'))
       if (!confirmed) return
 
-      api.post('/migrations/run', { skip: true, targets: id }).then(() => {
+      api.post('/migrations/run', { skip: '', targets: id }).then(() => {
         this.$refs.view.fetchQueries()
       })
     }