diff --git a/controller/option.go b/controller/option.go
index 3e59c68e0..7d1c676f5 100644
--- a/controller/option.go
+++ b/controller/option.go
@@ -129,7 +129,7 @@ func UpdateOption(c *gin.Context) {
 			return
 		}
 	case "ImageRatio":
-		err = ratio_setting.UpdateImageRatioByJSONString(option.Value)
+		err = ratio_setting.UpdateImageRatioByJSONString(option.Value.(string))
 		if err != nil {
 			c.JSON(http.StatusOK, gin.H{
 				"success": false,
@@ -138,7 +138,7 @@ func UpdateOption(c *gin.Context) {
 			return
 		}
 	case "AudioRatio":
-		err = ratio_setting.UpdateAudioRatioByJSONString(option.Value)
+		err = ratio_setting.UpdateAudioRatioByJSONString(option.Value.(string))
 		if err != nil {
 			c.JSON(http.StatusOK, gin.H{
 				"success": false,
@@ -147,7 +147,7 @@ func UpdateOption(c *gin.Context) {
 			return
 		}
 	case "AudioCompletionRatio":
-		err = ratio_setting.UpdateAudioCompletionRatioByJSONString(option.Value)
+		err = ratio_setting.UpdateAudioCompletionRatioByJSONString(option.Value.(string))
 		if err != nil {
 			c.JSON(http.StatusOK, gin.H{
 				"success": false,