diff --git a/CHANGELOG.md b/CHANGELOG.md
index 382ffc9c..6e52f9ed 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,7 @@ Check [Keep a Changelog](http://keepachangelog.com/) for recommendations on how
 ## [0.1.1]
 ### Fixed
 - Fixed a bug in LeetCode Explorer [(#3)](https://github.com/jdneo/vscode-leetcode/issues/3)
+- Remove the show problem command from command palette [(#4)](https://github.com/jdneo/vscode-leetcode/issues/4)
 
 ## [0.1.0]
 ### Added
diff --git a/package.json b/package.json
index b944410c..1038f250 100644
--- a/package.json
+++ b/package.json
@@ -2,7 +2,7 @@
     "name": "vscode-leetcode",
     "displayName": "LeetCode",
     "description": "Solve LeetCode problems in VS Code",
-    "version": "0.1.0",
+    "version": "0.1.1",
     "author": "Sheng Chen",
     "publisher": "shengchen",
     "icon": "resources/LeetCode.png",
diff --git a/src/commands/session.ts b/src/commands/session.ts
index 2cc4834b..5f767d2d 100644
--- a/src/commands/session.ts
+++ b/src/commands/session.ts
@@ -70,7 +70,7 @@ async function parseSessionsToPicks(p: Promise<ISession[]>): Promise<Array<IQuic
 export async function createSession(channel: vscode.OutputChannel): Promise<void> {
     const session: string | undefined = await vscode.window.showInputBox({
         prompt: "Enter the new session name.",
-        validateInput: (s: string) => s.trim() ? undefined : "Session name must not be empty",
+        validateInput: (s: string) => s && s.trim() ? undefined : "Session name must not be empty",
     });
     if (!session) {
         return;
diff --git a/src/commands/show.ts b/src/commands/show.ts
index 32265b71..2f0cfffd 100644
--- a/src/commands/show.ts
+++ b/src/commands/show.ts
@@ -14,7 +14,7 @@ export async function showProblem(channel: vscode.OutputChannel, node?: LeetCode
     if (!node) {
         return;
     }
-    await showProblemInternal(channel, node.id.split(".")[1]);
+    await showProblemInternal(channel, node.id);
 }
 
 export async function searchProblem(channel: vscode.OutputChannel): Promise<void> {
diff --git a/src/leetCodeManager.ts b/src/leetCodeManager.ts
index ee1ec44a..af73e882 100644
--- a/src/leetCodeManager.ts
+++ b/src/leetCodeManager.ts
@@ -55,7 +55,7 @@ class LeetCodeManager extends EventEmitter implements ILeetCodeManager {
                 childProc.on("error", reject);
                 const name: string | undefined = await vscode.window.showInputBox({
                     prompt: "Enter user name.",
-                    validateInput: (s: string) => s.trim() ? undefined : "User name must not be empty",
+                    validateInput: (s: string) => s && s.trim() ? undefined : "User name must not be empty",
                 });
                 if (!name) {
                     childProc.kill();