diff --git a/data/helpers.d/config b/data/helpers.d/config
index 247d12d6f..5999387db 100644
--- a/data/helpers.d/config
+++ b/data/helpers.d/config
@@ -66,7 +66,7 @@ _ynh_app_config_apply_one() {
             "set__${bind%%(*}" $short_setting $type $bind
 
         elif [[ "$bind" == "null" ]]; then
-            continue
+            return
 
         # Save in a file
         elif [[ "$type" == "file" ]]; then
diff --git a/data/helpers.d/utils b/data/helpers.d/utils
index 0e38423f2..a4afdaf88 100644
--- a/data/helpers.d/utils
+++ b/data/helpers.d/utils
@@ -542,7 +542,7 @@ ynh_read_var_in_file() {
     fi
 
     # Remove comments if needed
-    local expression="$(echo "$expression_with_comment" | sed "s@$comments[^$string]*\$@@g" | sed "s@\s*[$endline]*\s*]*\$@@")"
+    local expression="$(echo "$expression_with_comment" | sed "s@${comments}[^$string]*\$@@g" | sed "s@\s*[$endline]*\s*]*\$@@")"
 
     local first_char="${expression:0:1}"
     if [[ "$first_char" == '"' ]]; then
@@ -620,7 +620,7 @@ ynh_write_var_in_file() {
     fi
 
     # Remove comments if needed
-    local expression="$(echo "$expression_with_comment" | sed "s@$comments[^$string]*\$@@g" | sed "s@\s*[$endline]*\s*]*\$@@")"
+    local expression="$(echo "$expression_with_comment" | sed "s@${comments}[^$string]*\$@@g" | sed "s@\s*[$endline]*\s*]*\$@@")"
     endline=${expression_with_comment#"$expression"}
     endline="$(echo "$endline" | sed 's/\\/\\\\/g')"
     value="$(echo "$value" | sed 's/\\/\\\\/g')"