diff --git a/source/libublsettings-char.c b/source/libublsettings-char.c
index bb5ce45..3acbd5f 100644
--- a/source/libublsettings-char.c
+++ b/source/libublsettings-char.c
@@ -132,6 +132,26 @@ int yon_char_check_element(char *target, char *element, char *divider){
     return found>-1;
 }
 
+int yon_char_check_elements(char *target, char *element, char *divider){
+    if (yon_char_is_empty(target)||yon_char_is_empty(element)||yon_char_is_empty(divider)) return 0;
+    int size;
+    int element_size;
+    config_str parsed = yon_char_parse(target,&size,divider);
+    config_str parsed_element = yon_char_parse(element,&element_size,divider);
+    for (int i=0;i<element_size;i++){
+        int found = yon_char_parsed_check_exist(parsed,size,element);
+        if (found<0){
+            yon_char_parsed_free(parsed,size);
+            yon_char_parsed_free(parsed_element,element_size);
+            return 0;
+        }
+
+    }
+    yon_char_parsed_free(parsed,size);
+    yon_char_parsed_free(parsed_element,element_size);
+    return 0;
+}
+
 char *yon_char_swap_element(const char *source, const char *a, const char *b, const char *divider){
     if (yon_char_is_empty(source)||yon_char_is_empty(a)||yon_char_is_empty(b)) return 0;
     int size;
diff --git a/source/libublsettings-config.c b/source/libublsettings-config.c
index 734b3e0..0dad04d 100644
--- a/source/libublsettings-config.c
+++ b/source/libublsettings-config.c
@@ -630,15 +630,18 @@ int yon_config_append_element(char *key, char *append, char *divider){
         int found = 0;
         yon_config_parameter *dict = (yon_config_parameter*)yon_dictionary_get((dictionary**)&__yon__config__strings,key);
         if (dict){
-            char *temp = yon_char_append_element((char*)dict->data,append,divider);
-            if (!yon_char_is_empty((char*)dict->data)) free(dict->data);
-            dict->data = temp;
-            dict->flag1 = 1;
-            yon_config_remove_ignore(key);
-            return 1;
+            if (!yon_char_check_elements((char*)dict->data,append,divider)){
+                char *temp = yon_char_append_element((char*)dict->data,append,divider);
+                if (!yon_char_is_empty((char*)dict->data)) free(dict->data);
+                dict->data = temp;
+                dict->flag1 = 1;
+                yon_config_remove_ignore(key);
+                return 1;
+            }
         }
         
-    } else return 0;
+    }
+    return 0;
 }
 
 int yon_config_force_append_element(char *key, char *append, char *divider){
@@ -1052,6 +1055,7 @@ config_str yon_config_load_file(FILE *file, int *str_len) {
 }
 
 char *yon_config_parameter_wrap(char *parameter_key){
+    if (!strstr(parameter_key,"[")) return yon_char_new(parameter_key);
     char *cur = NULL;
     int size;
     config_str parsed = yon_char_parse(parameter_key,&size,"[");
@@ -1061,6 +1065,7 @@ char *yon_config_parameter_wrap(char *parameter_key){
     char *half_wrapped = yon_char_parsed_to_string_full(parsed,size,"[");
     yon_char_parsed_free(parsed,size);
     parsed = yon_char_parse(half_wrapped,&size,"]");
+    if (size>1)
     temp = yon_char_append_c(parsed[size-2],'\'');
     free(parsed[size-2]);
     parsed[size-2] = temp;
@@ -1075,7 +1080,7 @@ char *yon_config_parameter_to_string(yon_config_parameter *parameter, int insert
     if (parameter){
         char *param_string = NULL;
         char *parameter_wrapped = yon_config_parameter_wrap(parameter->key);
-        param_string = yon_char_unite(insert_section?parameter->section:"",insert_section?" ":"", parameter_wrapped,parameter->flag1==-1?NULL:"","=\'",parameter->data,"\'",NULL);
+        param_string = yon_char_unite(insert_section?parameter->section:"",insert_section?" ":"", parameter_wrapped,parameter->flag1==-1?NULL:"","=\'",yon_char_return_if_exist(parameter->data,""),"\'",NULL);
         return param_string;
     }
     return NULL;
diff --git a/source/libublsettings.h b/source/libublsettings.h
index 573c5b5..6df4e36 100644
--- a/source/libublsettings.h
+++ b/source/libublsettings.h
@@ -695,8 +695,19 @@ char *yon_char_unite(const char *source, ...);
 
 char *yon_cut(char *source, int size, int startpos);
 
-int yon_char_check_element(char *target, char *element, char *divider);
+/// @brief Check if elements string contains string
+/// @param source Source element string for search
+/// @param element The checked string
+/// @param separator String, separating elements within parameter's value
+/// @return 
+int yon_char_check_element(char *source, char *element, char *separator);
 
+/// @brief Check if elements string contains another elements string
+/// @param source_string Source element string for search
+/// @param target_string Target element string, which compares with source string
+/// @param separator String, separating elements within parameter's value
+/// @return 
+int yon_char_check_elements(char *source_string, char *target_string, char *separator);
 
 /// @brief Swap 2 substrings.
 /// @param source Source string