diff --git a/src/core/helpers/protocol/media/choose-file.js b/src/core/helpers/protocol/media/choose-file.js
index f92bb4999bd8820241619027a31ee0462d23f6eb..cba365865b7d8373ca839b387927c55b2ef07f3d 100644
--- a/src/core/helpers/protocol/media/choose-file.js
+++ b/src/core/helpers/protocol/media/choose-file.js
@@ -32,6 +32,9 @@ export const chooseFile = {
   },
   extension: {
     type: Array,
-    default: ['']
+    default: [''],
+    validator (extension, params) {
+      if (extension.length === 0) { return 'param extension should not be empty.' }
+    }
   }
 }
diff --git a/src/core/helpers/protocol/media/choose-image.js b/src/core/helpers/protocol/media/choose-image.js
index 51712823d05ecaa2c624ffebd2c8c82346430958..92d0bfbfbbf6bdf33c64a4e419ea3ab48b1e8c76 100644
--- a/src/core/helpers/protocol/media/choose-image.js
+++ b/src/core/helpers/protocol/media/choose-image.js
@@ -35,7 +35,7 @@ export const chooseImage = {
     type: Array,
     default: ['*'],
     validator (extension, params) {
-      if (extension.length === 0) params.extension = ['*']
+      if (extension.length === 0) { return 'param extension should not be empty.' }
     }
   }
 }
diff --git a/src/core/helpers/protocol/media/choose-video.js b/src/core/helpers/protocol/media/choose-video.js
index b10f248e8a722445ae5b2195c849df165dbdea52..86b29aae5c8a655fa6f652019a683087b1d5c0ed 100644
--- a/src/core/helpers/protocol/media/choose-video.js
+++ b/src/core/helpers/protocol/media/choose-video.js
@@ -22,7 +22,7 @@ export const chooseVideo = {
     type: Array,
     default: ['*'],
     validator (extension, params) {
-      if (extension.length === 0) params.extension = ['*']
+      if (extension.length === 0) { return 'param extension should not be empty.' }
     }
   }
 }