move exportInProgress reset to finally block

src/services/exportService.ts

@@ -163,11 +163,12 @@ class ExportService {
                 exportDir
             );
             const resp = await this.exportInProgress;
-            this.exportInProgress = null;
             return resp;
         } catch (e) {
             logError(e, 'exportFiles failed');
             return { paused: false };
+        } finally {
+            this.exportInProgress = null;
         }
     }