diff --git a/dist/index.js b/dist/index.js
index 5db4164a6..02dcc1f43 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -259,17 +259,27 @@ function run() {
             core.endGroup();
             const meta = new meta_1.Meta(inputs, context, repo);
             const version = meta.version;
-            core.startGroup(`Docker image version`);
-            core.info(version.main || '');
-            core.endGroup();
+            if (meta.version.main == undefined || meta.version.main.length == 0) {
+                core.warning(`Docker image version not found. Check tags input.`);
+            }
+            else {
+                core.startGroup(`Docker image version`);
+                core.info(version.main || '');
+                core.endGroup();
+            }
             core.setOutput('version', version.main || '');
             // Docker tags
             const tags = meta.getTags();
-            core.startGroup(`Docker tags`);
-            for (let tag of tags) {
-                core.info(tag);
+            if (tags.length == 0) {
+                core.warning('No tag has been generated. Check tags input.');
+            }
+            else {
+                core.startGroup(`Docker tags`);
+                for (let tag of tags) {
+                    core.info(tag);
+                }
+                core.endGroup();
             }
-            core.endGroup();
             core.setOutput('tags', tags.join(inputs.sepTags));
             // Docker labels
             const labels = meta.getLabels();
diff --git a/src/main.ts b/src/main.ts
index 27611091d..fc615d3a1 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -29,18 +29,26 @@ async function run() {
     const meta: Meta = new Meta(inputs, context, repo);
 
     const version: Version = meta.version;
-    core.startGroup(`Docker image version`);
-    core.info(version.main || '');
-    core.endGroup();
+    if (meta.version.main == undefined || meta.version.main.length == 0) {
+      core.warning(`Docker image version not found. Check tags input.`);
+    } else {
+      core.startGroup(`Docker image version`);
+      core.info(version.main || '');
+      core.endGroup();
+    }
     core.setOutput('version', version.main || '');
 
     // Docker tags
     const tags: Array<string> = meta.getTags();
-    core.startGroup(`Docker tags`);
-    for (let tag of tags) {
-      core.info(tag);
+    if (tags.length == 0) {
+      core.warning('No tag has been generated. Check tags input.');
+    } else {
+      core.startGroup(`Docker tags`);
+      for (let tag of tags) {
+        core.info(tag);
+      }
+      core.endGroup();
     }
-    core.endGroup();
     core.setOutput('tags', tags.join(inputs.sepTags));
 
     // Docker labels