mod

internal/server/server.go

@@ -49,7 +49,7 @@ func AddUsedDuration(c *gin.Context) {
 		return
 	} else {
 		freeTrialDuration := totalFreeDuration - existed
-		if totalFreeDuration <= existed || freeTrialDuration > totalFreeDuration {
+		if freeTrialDuration > totalFreeDuration || freeTrialDuration < 0 {
 			freeTrialDuration = 0
 		}
 		c.JSON(http.StatusOK, dto.ConfigResponse{