diff --git a/dot/.bashrc.d/android-studio.bash b/dot/.bashrc.d/android-studio.bash
index a1fbd7f..2fb75cf 100644
--- a/dot/.bashrc.d/android-studio.bash
+++ b/dot/.bashrc.d/android-studio.bash
@@ -5,7 +5,9 @@ unset basedir
 
 export JAVA_HOME="/opt/android-studio/jbr"
 export ANDROID_HOME="${HOME}/Android/Sdk"
-export NDK_HOME="$ANDROID_HOME/ndk/$(ls -1 $ANDROID_HOME/ndk)"
 
-add-to-path "${ANDROID_HOME}/emulator" "${ANDROID_HOME}/platform-tools"
+if [[ -d "${ANDROID_HOME}/ndk" ]]; then
+    export NDK_HOME="$ANDROID_HOME/ndk/$(ls -1 $ANDROID_HOME/ndk)"
+fi
 
+add-to-path -s "${ANDROID_HOME}/emulator" "${ANDROID_HOME}/platform-tools"
diff --git a/dot/.bashrc.d/function.bash b/dot/.bashrc.d/function.bash
index 3fef356..3714360 100644
--- a/dot/.bashrc.d/function.bash
+++ b/dot/.bashrc.d/function.bash
@@ -31,13 +31,36 @@ generate-bash-completion() {
 }
 
 add-to-path() {
-    if [[ $# -eq 0 ]]; then
-        echo "usage: add-to-path <path1> [path2 ...]" >&2
+    local silence=false
+    local -a dirs=()
+
+    while [[ $# -gt 0 ]]; do
+        case "$1" in
+            -s)
+                silence=true
+                shift
+                ;;
+            --)
+                shift
+                dirs+=("$@")
+                break
+                ;;
+            *)
+            dirs+=("$1")
+            shift
+            ;;
+        esac
+    done
+
+    if [[ ${#dirs[@]} -eq 0 ]]; then
+        echo "usage: add-to-path [-s] <path1> [path2 ...]" >&2
+        echo "" >&2
+        echo " -s: if some path not exist, just skip it silently" >&2
+        echo "" >&2
         echo "example: add-to-path /usr/local/bin /tmp/my-dir" >&2
         return 1
     fi
 
-    local -a dirs=("$@")
     local dir
     local dir_normalized
     local new_path="$PATH"
@@ -47,7 +70,9 @@ add-to-path() {
 
         dir_normalized="${dir%/}"
         if [[ ! -d "$dir_normalized" ]]; then
-            echo "WARNING: '${dir}' is not a valid directory, skipped." >&2
+            if [[ "$silence" == false ]]; then
+                echo "WARNING: '${dir}' is not a valid directory, skipped." >&2
+            fi
             continue
         fi
 
diff --git a/dot/.bashrc.d/pnpm.bash b/dot/.bashrc.d/pnpm.bash
index 57633fd..5929129 100755
--- a/dot/.bashrc.d/pnpm.bash
+++ b/dot/.bashrc.d/pnpm.bash
@@ -4,7 +4,7 @@ source "${basedir}/function.bash"
 unset basedir
 
 export PNPM_HOME="${HOME}/.local/share/pnpm"
-add-to-path $PNPM_HOME
+add-to-path -s $PNPM_HOME
 
 if [[ -x "$(type -p pnpm)" ]]; then
     generate-bash-completion pnpm "pnpm completion bash"
diff --git a/dot/.bashrc.d/volta.bash b/dot/.bashrc.d/volta.bash
index 8d3d572..a0b2628 100644
--- a/dot/.bashrc.d/volta.bash
+++ b/dot/.bashrc.d/volta.bash
@@ -21,5 +21,3 @@ if [[ -x $(type -p volta) || -x "${VOLTA_HOME}/bin/volta" ]]; then
         unhash-command-in-dirs "$bin_dir"
     }
 fi
-
-