diff --git a/arduino-ide-extension/src/node/boards-service-impl.ts b/arduino-ide-extension/src/node/boards-service-impl.ts
index 5f5f1e26..ed5b7b5c 100644
--- a/arduino-ide-extension/src/node/boards-service-impl.ts
+++ b/arduino-ide-extension/src/node/boards-service-impl.ts
@@ -64,6 +64,11 @@ export class BoardsServiceImpl extends CoreClientAware implements BoardsService
                     resolve(undefined);
                     return;
                 }
+                // It's a hack to handle https://github.com/arduino/arduino-cli/issues/1262 gracefully.
+                if (err.message.indexOf('unknown package') !== -1) {
+                    resolve(undefined);
+                    return;
+                }
                 reject(err);
                 return;
             }
diff --git a/arduino-ide-extension/src/node/library-service-server-impl.ts b/arduino-ide-extension/src/node/library-service-server-impl.ts
index 7b65d4f8..ac6fa277 100644
--- a/arduino-ide-extension/src/node/library-service-server-impl.ts
+++ b/arduino-ide-extension/src/node/library-service-server-impl.ts
@@ -94,6 +94,13 @@ export class LibraryServiceImpl extends CoreClientAware implements LibraryServic
                         resolve(undefined);
                         return;
                     }
+
+                    // It's a hack to handle https://github.com/arduino/arduino-cli/issues/1262 gracefully.
+                    if (message.indexOf('unknown package') !== -1) {
+                        resolve(undefined);
+                        return;
+                    }
+
                     reject(error);
                     return;
                 }