diff --git a/dist/index.js b/dist/index.js
index 4048718..a3f93c5 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -9748,7 +9748,8 @@ if (!!core.getInput('customHeaders')) {
   try {
     customHeaders = JSON.parse(core.getInput('customHeaders'));
   } catch(error) {
-    core.error('Could not parse customHeaders string value')
+    core.debug(`Invalid customHeaders string: ${core.getInput('customHeaders')}`)
+    core.error(`Could not parse customHeaders string value: ${error}`)
   }
 }
 
diff --git a/src/index.js b/src/index.js
index 75147d9..b88b9c2 100644
--- a/src/index.js
+++ b/src/index.js
@@ -13,7 +13,8 @@ if (!!core.getInput('customHeaders')) {
   try {
     customHeaders = JSON.parse(core.getInput('customHeaders'));
   } catch(error) {
-    core.error('Could not parse customHeaders string value')
+    core.debug(`Invalid customHeaders string: ${core.getInput('customHeaders')}`)
+    core.error(`Could not parse customHeaders string value: ${error}`)
   }
 }