diff --git a/service/image.go b/service/image.go
index 252093f1f..453d8dd1c 100644
--- a/service/image.go
+++ b/service/image.go
@@ -21,6 +21,10 @@ func DecodeBase64ImageData(base64String string) (image.Config, string, string, e
 		base64String = base64String[idx+1:]
 	}
 
+	if len(base64String) == 0 {
+		return image.Config{}, "", "", errors.New("base64 string is empty")
+	}
+
 	// 将base64字符串解码为字节切片
 	decodedData, err := base64.StdEncoding.DecodeString(base64String)
 	if err != nil {
diff --git a/service/token_counter.go b/service/token_counter.go
index bac6c067b..84b413287 100644
--- a/service/token_counter.go
+++ b/service/token_counter.go
@@ -301,7 +301,7 @@ func CountRequestToken(c *gin.Context, meta *types.TokenCountMeta, info *relayco
 		}
 	}
 
-	for _, file := range meta.Files {
+	for i, file := range meta.Files {
 		switch file.FileType {
 		case types.FileTypeImage:
 			if info.RelayFormat == types.RelayFormatGemini {
@@ -309,7 +309,7 @@ func CountRequestToken(c *gin.Context, meta *types.TokenCountMeta, info *relayco
 			} else {
 				token, err := getImageToken(file, model, info.IsStream)
 				if err != nil {
-					return 0, fmt.Errorf("error counting image token: %v", err)
+					return 0, fmt.Errorf("error counting image token, media index[%d], original data[%s], err: %v", i, file.OriginData, err)
 				}
 				tkm += token
 			}