diff --git a/dist/index.js b/dist/index.js
index f27c8df..11b0695 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -92,6 +92,11 @@ function findComment(inputs) {
         return undefined;
     });
 }
+function getErrorMessage(error) {
+    if (error instanceof Error)
+        return error.message;
+    return String(error);
+}
 function run() {
     return __awaiter(this, void 0, void 0, function* () {
         try {
@@ -118,7 +123,7 @@ function run() {
         }
         catch (error) {
             core.debug((0, util_1.inspect)(error));
-            core.setFailed(error.message);
+            core.setFailed(getErrorMessage(error));
         }
     });
 }
diff --git a/src/main.ts b/src/main.ts
index 704ad30..e8e6c4c 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -66,6 +66,11 @@ async function findComment(inputs: Inputs): Promise<Comment | undefined> {
   return undefined
 }
 
+function getErrorMessage(error: unknown) {
+  if (error instanceof Error) return error.message
+  return String(error)
+}
+
 async function run(): Promise<void> {
   try {
     const inputs: Inputs = {
@@ -89,9 +94,9 @@ async function run(): Promise<void> {
       core.setOutput('comment-body', '')
       core.setOutput('comment-author', '')
     }
-  } catch (error: any) {
+  } catch (error) {
     core.debug(inspect(error))
-    core.setFailed(error.message)
+    core.setFailed(getErrorMessage(error))
   }
 }