diff --git a/lib/config-utils.js b/lib/config-utils.js
index 4f49e49da..1609bac82 100644
--- a/lib/config-utils.js
+++ b/lib/config-utils.js
@@ -153,6 +153,14 @@ function getConfigFileRepoFormatInvalidMessage(configFile) {
     return error;
 }
 exports.getConfigFileRepoFormatInvalidMessage = getConfigFileRepoFormatInvalidMessage;
+function getConfigFileFormatInvalidMessage(configFile) {
+    return 'The configuration file "' + configFile + '" could not be read';
+}
+exports.getConfigFileFormatInvalidMessage = getConfigFileFormatInvalidMessage;
+function getConfigFileDirectoryGivenMessage(configFile) {
+    return 'The configuration file "' + configFile + '" looks like a directory, not a file';
+}
+exports.getConfigFileDirectoryGivenMessage = getConfigFileDirectoryGivenMessage;
 function getConfigFilePropertyError(configFile, property, error) {
     return 'The configuration file "' + configFile + '" is invalid: property "' + property + '" ' + error;
 }
@@ -256,11 +264,16 @@ async function getRemoteConfig(configFile) {
         path: pieces.groups.path,
         ref: pieces.groups.ref,
     });
-    // todo handle response.encoding not being base64
     let fileContents;
-    if ("content" in response.data) {
+    if ("content" in response.data && response.data.content !== undefined) {
         fileContents = response.data.content;
-    } // todo handle else case
+    }
+    else if (Array.isArray(response.data)) {
+        throw new Error(getConfigFileDirectoryGivenMessage(configFile));
+    }
+    else {
+        throw new Error(getConfigFileFormatInvalidMessage(configFile));
+    }
     return yaml.safeLoad(Buffer.from(fileContents, 'base64').toString('binary'));
 }
 function getConfigFolder() {
diff --git a/lib/config-utils.js.map b/lib/config-utils.js.map
index febbe6483..d94c1dfa2 100644
--- a/lib/config-utils.js.map
+++ b/lib/config-utils.js.map
@@ -1 +1 @@
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\ No newline at end of file
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\ No newline at end of file
diff --git a/lib/config-utils.test.js b/lib/config-utils.test.js
index 2f7698a6f..917e60c26 100644
--- a/lib/config-utils.test.js
+++ b/lib/config-utils.test.js
@@ -164,6 +164,60 @@ ava_1.default("API client used when reading remote config", async (t) => {
         sinon_1.default.restore();
     });
 });
+ava_1.default("Remote config handles the case where a directory is provided", async (t) => {
+    return await util.withTmpDir(async (tmpDir) => {
+        process.env['RUNNER_TEMP'] = tmpDir;
+        process.env['GITHUB_WORKSPACE'] = tmpDir;
+        const dummyResponse = {
+            data: [],
+        };
+        let ok = new octokit.Octokit({
+            userAgent: "CodeQL Action",
+        });
+        const repos = ok.repos;
+        sinon_1.default.stub(repos, "getContents").resolves(Promise.resolve(dummyResponse));
+        ok.repos = repos;
+        sinon_1.default.stub(api, "client").value(ok);
+        const repoReference = 'octo-org/codeql-config/config.yaml@main';
+        setInput('config-file', repoReference);
+        try {
+            await configUtils.loadConfig();
+            throw new Error('loadConfig did not throw error');
+        }
+        catch (err) {
+            t.deepEqual(err, new Error(configUtils.getConfigFileDirectoryGivenMessage(repoReference)));
+        }
+        sinon_1.default.restore();
+    });
+});
+ava_1.default("Invalid format of remote config handled correctly", async (t) => {
+    return await util.withTmpDir(async (tmpDir) => {
+        process.env['RUNNER_TEMP'] = tmpDir;
+        process.env['GITHUB_WORKSPACE'] = tmpDir;
+        const dummyResponse = {
+            data: {
+            // note no "content" property here
+            }
+        };
+        let ok = new octokit.Octokit({
+            userAgent: "CodeQL Action",
+        });
+        const repos = ok.repos;
+        sinon_1.default.stub(repos, "getContents").resolves(Promise.resolve(dummyResponse));
+        ok.repos = repos;
+        sinon_1.default.stub(api, "client").value(ok);
+        const repoReference = 'octo-org/codeql-config/config.yaml@main';
+        setInput('config-file', repoReference);
+        try {
+            await configUtils.loadConfig();
+            throw new Error('loadConfig did not throw error');
+        }
+        catch (err) {
+            t.deepEqual(err, new Error(configUtils.getConfigFileFormatInvalidMessage(repoReference)));
+        }
+        sinon_1.default.restore();
+    });
+});
 function doInvalidInputTest(testName, inputFileContents, expectedErrorMessageGenerator) {
     ava_1.default("load invalid input - " + testName, async (t) => {
         return await util.withTmpDir(async (tmpDir) => {
diff --git a/lib/config-utils.test.js.map b/lib/config-utils.test.js.map
index 7c9c7fd90..f82dc6739 100644
--- a/lib/config-utils.test.js.map
+++ b/lib/config-utils.test.js.map
@@ -1 +1 @@
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\ No newline at end of file
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\ No newline at end of file
diff --git a/src/config-utils.test.ts b/src/config-utils.test.ts
index 4efef1cd2..550b43026 100644
--- a/src/config-utils.test.ts
+++ b/src/config-utils.test.ts
@@ -182,6 +182,68 @@ test("API client used when reading remote config", async t => {
   });
 });
 
+test("Remote config handles the case where a directory is provided", async t => {
+  return await util.withTmpDir(async tmpDir => {
+    process.env['RUNNER_TEMP'] = tmpDir;
+    process.env['GITHUB_WORKSPACE'] = tmpDir;
+
+    const dummyResponse = {
+      data: [], // directories are returned as arrays
+    };
+
+    let ok = new octokit.Octokit({
+      userAgent: "CodeQL Action",
+    });
+    const repos = ok.repos;
+    sinon.stub(repos, "getContents").resolves(Promise.resolve(dummyResponse));
+    ok.repos = repos;
+    sinon.stub(api, "client").value(ok);
+
+    const repoReference = 'octo-org/codeql-config/config.yaml@main';
+    setInput('config-file', repoReference);
+    try {
+      await configUtils.loadConfig();
+      throw new Error('loadConfig did not throw error');
+    } catch (err) {
+      t.deepEqual(err, new Error(configUtils.getConfigFileDirectoryGivenMessage(repoReference)));
+    }
+
+    sinon.restore();
+  });
+});
+
+test("Invalid format of remote config handled correctly", async t => {
+  return await util.withTmpDir(async tmpDir => {
+    process.env['RUNNER_TEMP'] = tmpDir;
+    process.env['GITHUB_WORKSPACE'] = tmpDir;
+
+    const dummyResponse = {
+      data: {
+        // note no "content" property here
+      }
+    };
+
+    let ok = new octokit.Octokit({
+      userAgent: "CodeQL Action",
+    });
+    const repos = ok.repos;
+    sinon.stub(repos, "getContents").resolves(Promise.resolve(dummyResponse));
+    ok.repos = repos;
+    sinon.stub(api, "client").value(ok);
+
+    const repoReference = 'octo-org/codeql-config/config.yaml@main';
+    setInput('config-file', repoReference);
+    try {
+      await configUtils.loadConfig();
+      throw new Error('loadConfig did not throw error');
+    } catch (err) {
+      t.deepEqual(err, new Error(configUtils.getConfigFileFormatInvalidMessage(repoReference)));
+    }
+
+    sinon.restore();
+  });
+});
+
 function doInvalidInputTest(
   testName: string,
   inputFileContents: string,
diff --git a/src/config-utils.ts b/src/config-utils.ts
index 26741ca12..fb5ccc0bf 100644
--- a/src/config-utils.ts
+++ b/src/config-utils.ts
@@ -171,6 +171,14 @@ export function getConfigFileRepoFormatInvalidMessage(configFile: string): strin
   return error;
 }
 
+export function getConfigFileFormatInvalidMessage(configFile: string): string {
+  return 'The configuration file "' + configFile + '" could not be read';
+}
+
+export function getConfigFileDirectoryGivenMessage(configFile: string): string {
+  return 'The configuration file "' + configFile + '" looks like a directory, not a file';
+}
+
 function getConfigFilePropertyError(configFile: string, property: string, error: string): string {
   return 'The configuration file "' + configFile + '" is invalid: property "' + property + '" ' + error;
 }
@@ -293,11 +301,14 @@ async function getRemoteConfig(configFile: string): Promise<any> {
     ref: pieces.groups.ref,
   });
 
-  // todo handle response.encoding not being base64
-  let fileContents;
-  if ("content" in response.data) {
+  let fileContents: string;
+  if ("content" in response.data && response.data.content !== undefined) {
     fileContents = response.data.content;
-  } // todo handle else case
+  } else if (Array.isArray(response.data)) {
+    throw new Error(getConfigFileDirectoryGivenMessage(configFile));
+  } else {
+    throw new Error(getConfigFileFormatInvalidMessage(configFile));
+  }
 
   return yaml.safeLoad(Buffer.from(fileContents, 'base64').toString('binary'));
 }