diff --git a/dist/index.js b/dist/index.js
index 0900b2d..9bb1efa 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -436,7 +436,7 @@ function run() {
             }
         }
         catch (error) {
-            core.setFailed(error.message);
+            core.setFailed(utils.getErrorMessage(error));
         }
     });
 }
@@ -738,7 +738,7 @@ var __importStar = (this && this.__importStar) || function (mod) {
     return result;
 };
 Object.defineProperty(exports, "__esModule", ({ value: true }));
-exports.getInputAsArray = exports.fileExistsSync = void 0;
+exports.getErrorMessage = exports.getInputAsArray = exports.fileExistsSync = void 0;
 const core = __importStar(__nccwpck_require__(2186));
 const fs = __importStar(__nccwpck_require__(5747));
 function fileExistsSync(path) {
@@ -750,10 +750,10 @@ function fileExistsSync(path) {
         stats = fs.statSync(path);
     }
     catch (error) {
-        if (error.code === 'ENOENT') {
+        if (hasErrorCode(error) && error.code === 'ENOENT') {
             return false;
         }
-        throw new Error(`Encountered an error when checking whether path '${path}' exists: ${error.message}`);
+        throw new Error(`Encountered an error when checking whether path '${path}' exists: ${getErrorMessage(error)}`);
     }
     if (!stats.isDirectory()) {
         return true;
@@ -771,6 +771,16 @@ function getStringAsArray(str) {
         .map(s => s.trim())
         .filter(x => x !== '');
 }
+/* eslint-disable  @typescript-eslint/no-explicit-any */
+function hasErrorCode(error) {
+    return typeof (error && error.code) === 'string';
+}
+function getErrorMessage(error) {
+    if (error instanceof Error)
+        return error.message;
+    return String(error);
+}
+exports.getErrorMessage = getErrorMessage;
 
 
 /***/ }),
diff --git a/src/main.ts b/src/main.ts
index bf63708..a4e2bb1 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -67,8 +67,8 @@ async function run(): Promise<void> {
     } else {
       core.info('No pull requests found.')
     }
-  } catch (error: any) {
-    core.setFailed(error.message)
+  } catch (error) {
+    core.setFailed(utils.getErrorMessage(error))
   }
 }
 
diff --git a/src/utils.ts b/src/utils.ts
index 2509712..52b8f48 100644
--- a/src/utils.ts
+++ b/src/utils.ts
@@ -9,13 +9,15 @@ export function fileExistsSync(path: string): boolean {
   let stats: fs.Stats
   try {
     stats = fs.statSync(path)
-  } catch (error: any) {
-    if (error.code === 'ENOENT') {
+  } catch (error) {
+    if (hasErrorCode(error) && error.code === 'ENOENT') {
       return false
     }
 
     throw new Error(
-      `Encountered an error when checking whether path '${path}' exists: ${error.message}`
+      `Encountered an error when checking whether path '${path}' exists: ${getErrorMessage(
+        error
+      )}`
     )
   }
 
@@ -39,3 +41,13 @@ function getStringAsArray(str: string): string[] {
     .map(s => s.trim())
     .filter(x => x !== '')
 }
+
+/* eslint-disable  @typescript-eslint/no-explicit-any */
+function hasErrorCode(error: any): error is {code: string} {
+  return typeof (error && error.code) === 'string'
+}
+
+export function getErrorMessage(error: unknown): string {
+  if (error instanceof Error) return error.message
+  return String(error)
+}