diff --git a/src/import/import-legacy.ts b/src/import/import-legacy.ts
index e5e96d1..44d1a2d 100644
--- a/src/import/import-legacy.ts
+++ b/src/import/import-legacy.ts
@@ -162,7 +162,7 @@ async function _importFragment(
   const fragmentEntryKey = fragment.slug;
   const status = 0;
   let previewFileEntryId = INVALID_FILE_ENTRY_ID;
-  let errorMessage;
+  let errorMessage = '';
 
   let existingFragment = await _getExistingFragment(
     groupId,
@@ -179,7 +179,7 @@ async function _importFragment(
         existingFragment ? existingFragment.previewFileEntryId : '0'
       );
     } catch (error) {
-      errorMessage = error.toString();
+      errorMessage = error instanceof Error ? error.toString() : `${error}`;
     }
   }
 
diff --git a/src/utils/auth-generator.ts b/src/utils/auth-generator.ts
index f446054..70c7d26 100644
--- a/src/utils/auth-generator.ts
+++ b/src/utils/auth-generator.ts
@@ -115,7 +115,7 @@ export default class AuthGenerator extends CustomGenerator {
       this.logMessage(
         'Connection unsuccessful,\n' +
           'please check your host information.\n\n' +
-          `${error.toString()}\n`,
+          `${error instanceof Error ? error.toString() : error}\n`,
         { level: 'error' }
       );