diff --git a/packages/builder/src/components/backend/DatasourceNavigator/modals/DatasourceConfigModal.svelte b/packages/builder/src/components/backend/DatasourceNavigator/modals/DatasourceConfigModal.svelte
index 21c7e07a25..31a0d21cd8 100644
--- a/packages/builder/src/components/backend/DatasourceNavigator/modals/DatasourceConfigModal.svelte
+++ b/packages/builder/src/components/backend/DatasourceNavigator/modals/DatasourceConfigModal.svelte
@@ -37,7 +37,7 @@
   }
 
   async function saveDatasource() {
-    if (integration.features[DatasourceFeature.CONNECTION_CHECKING]) {
+    if (integration.features?.[DatasourceFeature.CONNECTION_CHECKING]) {
       const valid = await validateConfig()
       if (!valid) {
         return false
diff --git a/packages/builder/src/pages/builder/app/[application]/data/datasource/[datasourceId]/index.svelte b/packages/builder/src/pages/builder/app/[application]/data/datasource/[datasourceId]/index.svelte
index a853fcea0c..c70ab492c4 100644
--- a/packages/builder/src/pages/builder/app/[application]/data/datasource/[datasourceId]/index.svelte
+++ b/packages/builder/src/pages/builder/app/[application]/data/datasource/[datasourceId]/index.svelte
@@ -65,7 +65,7 @@
   }
 
   const saveDatasource = async () => {
-    if (integration.features[DatasourceFeature.CONNECTION_CHECKING]) {
+    if (integration.features?.[DatasourceFeature.CONNECTION_CHECKING]) {
       const valid = await validateConfig()
       if (!valid) {
         return false
diff --git a/packages/server/src/sdk/app/datasources/datasources.ts b/packages/server/src/sdk/app/datasources/datasources.ts
index c886e6a15f..25b05e351e 100644
--- a/packages/server/src/sdk/app/datasources/datasources.ts
+++ b/packages/server/src/sdk/app/datasources/datasources.ts
@@ -135,7 +135,7 @@ export function mergeConfigs(update: Datasource, old: Datasource) {
   // specific to REST datasources, fix the auth configs again if required
   if (hasAuthConfigs(update)) {
     const configs = update.config.authConfigs as RestAuthConfig[]
-    const oldConfigs = old.config?.authConfigs as RestAuthConfig[]
+    const oldConfigs = old.config?.authConfigs as RestAuthConfig[] || []
     for (let config of configs) {
       if (config.type !== RestAuthType.BASIC) {
         continue