diff --git a/ui/plugin-katex/package.json b/ui/plugin-katex/package.json
index 3c4a0acb..14dd5663 100644
--- a/ui/plugin-katex/package.json
+++ b/ui/plugin-katex/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@artalk/plugin-katex",
-  "version": "0.2.2",
+  "version": "0.2.3",
   "minAppVersion": "2.8.6",
   "license": "MIT",
   "description": "The katex plugin for artalk",
diff --git a/ui/plugin-katex/src/main.ts b/ui/plugin-katex/src/main.ts
index 6de86d83..1758838a 100644
--- a/ui/plugin-katex/src/main.ts
+++ b/ui/plugin-katex/src/main.ts
@@ -75,6 +75,13 @@ export const ArtalkKatexPlugin: ArtalkPlugin = (ctx) => {
       return
     }
 
+    if (typeof katex === 'undefined') {
+      console.error(
+        '[artalk-plugin-katex] katex not found, please make sure you have imported katex in your project',
+      )
+      return
+    }
+
     markedInstance.use({
       extensions: [blockMathExtension, inlineMathExtension],
     })