diff --git a/core/src/actions/auth.ts b/core/src/actions/auth.ts
index 49fab04c..f05e0d69 100644
--- a/core/src/actions/auth.ts
+++ b/core/src/actions/auth.ts
@@ -86,18 +86,22 @@ export function loginUser(credentials: Credentials) {
       .then(user => {
         dispatch(authenticate(user));
       })
-      .catch((error: Error) => {
+      .catch((error: unknown) => {
         console.error(error);
-        dispatch(
-          addSnackbar({
-            type: 'warning',
-            message: {
-              key: 'ui.toast.onFailToAuth',
-              message: error.message,
-            },
-          }),
-        );
-        dispatch(authError(error));
+        if (error instanceof Error) {
+          dispatch(
+            addSnackbar({
+              type: 'warning',
+              message: {
+                key: 'ui.toast.onFailToAuth',
+                options: {
+                  details: error.message,
+                },
+              },
+            }),
+          );
+          dispatch(authError(error));
+        }
       });
   };
 }
diff --git a/core/src/actions/entries.ts b/core/src/actions/entries.ts
index f391b469..0fe996d6 100644
--- a/core/src/actions/entries.ts
+++ b/core/src/actions/entries.ts
@@ -624,7 +624,9 @@ export function loadEntry(collection: Collection, slug: string, silent = false)
             type: 'error',
             message: {
               key: 'ui.toast.onFailToLoadEntries',
-              details: error.message,
+              options: {
+                details: error.message,
+              },
             },
           }),
         );
@@ -744,7 +746,9 @@ export function loadEntries(collection: Collection, page = 0) {
             type: 'error',
             message: {
               key: 'ui.toast.onFailToLoadEntries',
-              details: error.message,
+              options: {
+                details: error.message,
+              },
             },
           }),
         );
@@ -803,7 +807,9 @@ export function traverseCollectionCursor(collection: Collection, action: string)
             type: 'error',
             message: {
               key: 'ui.toast.onFailToLoadEntries',
-              details: error.message,
+              options: {
+                details: error.message,
+              },
             },
           }),
         );
@@ -1071,7 +1077,9 @@ export function persistEntry(collection: Collection) {
             type: 'error',
             message: {
               key: 'ui.toast.onFailToPersist',
-              details: error,
+              options: {
+                details: error,
+              },
             },
           }),
         );
@@ -1102,7 +1110,9 @@ export function deleteEntry(collection: Collection, slug: string) {
             type: 'error',
             message: {
               key: 'ui.toast.onFailToDelete',
-              details: error,
+              options: {
+                details: error,
+              },
             },
           }),
         );
diff --git a/core/src/actions/mediaLibrary.ts b/core/src/actions/mediaLibrary.ts
index 866c5791..e9fe4a93 100644
--- a/core/src/actions/mediaLibrary.ts
+++ b/core/src/actions/mediaLibrary.ts
@@ -337,7 +337,9 @@ export function persistMedia(file: File, opts: MediaOptions = {}) {
           type: 'error',
           message: {
             key: 'ui.toast.onFailToPersistMedia',
-            details: error,
+            options: {
+              details: error,
+            },
           },
         }),
       );
@@ -381,7 +383,9 @@ export function deleteMedia(file: MediaFile, opts: MediaOptions = {}) {
               type: 'error',
               message: {
                 key: 'ui.toast.onFailToDeleteMedia',
-                details: error.message,
+                options: {
+                  details: error.message,
+                },
               },
             }),
           );
@@ -417,7 +421,9 @@ export function deleteMedia(file: MediaFile, opts: MediaOptions = {}) {
             type: 'error',
             message: {
               key: 'ui.toast.onFailToDeleteMedia',
-              details: error.message,
+              options: {
+                details: error.message,
+              },
             },
           }),
         );
diff --git a/core/src/actions/status.ts b/core/src/actions/status.ts
index 9a3768f4..e27191e7 100644
--- a/core/src/actions/status.ts
+++ b/core/src/actions/status.ts
@@ -55,7 +55,10 @@ export function checkBackendStatus() {
           dispatch(
             addSnackbar({
               type: 'error',
-              message: { key: 'ui.toast.onBackendDown', details: status.api.statusPage },
+              message: {
+                key: 'ui.toast.onBackendDown',
+                options: { details: status.api.statusPage },
+              },
             }),
           );
         }
diff --git a/core/src/backends/azure/AuthenticationPage.tsx b/core/src/backends/azure/AuthenticationPage.tsx
index 924ccfe5..bc7c9b3e 100644
--- a/core/src/backends/azure/AuthenticationPage.tsx
+++ b/core/src/backends/azure/AuthenticationPage.tsx
@@ -34,7 +34,7 @@ const AzureAuthenticationPage = ({
       if (err) {
         alert({
           title: 'auth.errors.authTitle',
-          body: { key: 'auth.errors.authBody', options: { details: err } },
+          body: { key: 'auth.errors.authBody', options: { details: err.toString() } },
         });
         return;
       } else if (data) {
diff --git a/core/src/store/slices/snackbars.ts b/core/src/store/slices/snackbars.ts
index d806f4b2..d840101e 100644
--- a/core/src/store/slices/snackbars.ts
+++ b/core/src/store/slices/snackbars.ts
@@ -11,9 +11,10 @@ export interface SnackbarMessage {
   type: MessageType;
   message:
     | string
-    | ({
+    | {
         key: string;
-      } & Record<string, unknown>);
+        options?: Record<string, unknown>;
+      };
 }
 
 // Define a type for the slice state