diff --git a/dist/index.js b/dist/index.js
index 4dbae9b..74f102d 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -447,7 +447,7 @@ function run() {
             }
             if (versions.length) {
                 const quality = core.getInput('dotnet-quality');
-                if (!qualityOptions.includes(quality)) {
+                if (quality && !qualityOptions.includes(quality)) {
                     throw new Error(`${quality} is not a supported value for 'dotnet-quality' option. Supported values are: daily, signed, validated, preview, ga.`);
                 }
                 let dotnetInstaller;
diff --git a/src/setup-dotnet.ts b/src/setup-dotnet.ts
index 0646980..2306362 100644
--- a/src/setup-dotnet.ts
+++ b/src/setup-dotnet.ts
@@ -50,7 +50,7 @@ export async function run() {
     if (versions.length) {
       const quality = core.getInput('dotnet-quality') as QualityOptions;
 
-      if (!qualityOptions.includes(quality)) {
+      if (quality && !qualityOptions.includes(quality)) {
         throw new Error(
           `${quality} is not a supported value for 'dotnet-quality' option. Supported values are: daily, signed, validated, preview, ga.`
         );