diff --git a/action-src/src/__snapshots__/action.test.ts.snap b/action-src/src/__snapshots__/action.test.ts.snap
index c209f991a..25e00e056 100644
--- a/action-src/src/__snapshots__/action.test.ts.snap
+++ b/action-src/src/__snapshots__/action.test.ts.snap
@@ -103,3 +103,86 @@ Array [
   "::set-output name=result::{\\"success\\":false,\\"number_of_issues\\":2,\\"number_of_files_checked\\":2,\\"files_with_issues\\":[\\"../fixtures/sampleCode/samples_with_errors/withErrors.ts\\"]}",
 ]
 `;
+
+exports[`Validate Action check files with issues fixtures/sampleCode/** 5`] = `Array []`;
+
+exports[`Validate Action check files with issues fixtures/sampleCode/** 6`] = `Array []`;
+
+exports[`Validate Action check files with issues fixtures/sampleCode/** 7`] = `
+Array [
+  Array [
+    "::warning::Unable to determine which files have changed, checking files: fixtures/sampleCode/**
+",
+  ],
+  Array [
+    "'fork'
+",
+  ],
+  Array [
+    "Files checked: 1, Issues found: 0 in 0 files.
+",
+  ],
+  Array [
+    "
+",
+  ],
+  Array [
+    "::set-output name=success::true
+",
+  ],
+  Array [
+    "
+",
+  ],
+  Array [
+    "::set-output name=number_of_files_checked::1
+",
+  ],
+  Array [
+    "
+",
+  ],
+  Array [
+    "::set-output name=number_of_issues::0
+",
+  ],
+  Array [
+    "
+",
+  ],
+  Array [
+    "::set-output name=number_of_files_with_issues::0
+",
+  ],
+  Array [
+    "
+",
+  ],
+  Array [
+    "::set-output name=files_with_issues::[]
+",
+  ],
+  Array [
+    "
+",
+  ],
+  Array [
+    "::set-output name=result::{\\"success\\":true,\\"number_of_issues\\":0,\\"number_of_files_checked\\":1,\\"files_with_issues\\":[]}
+",
+  ],
+]
+`;
+
+exports[`Validate Action check files with issues fixtures/sampleCode/** 8`] = `
+Array [
+  "::warning::Unable to determine which files have changed, checking files: fixtures/sampleCode/**",
+  "'fork'",
+  "Files checked: 1, Issues found: 0 in 0 files.",
+  "::set-output name=success::true",
+  "::set-output name=number_of_files_checked::1",
+  "::set-output name=number_of_issues::0",
+  "::set-output name=number_of_files_with_issues::0",
+  "::set-output name=files_with_issues::[]",
+  "::set-output name=result::{\\"success\\":true,\\"number_of_issues\\":0,\\"number_of_files_checked\\":1,\\"files_with_issues\\":[]}",
+]
+`;
diff --git a/action-src/src/action.test.ts b/action-src/src/action.test.ts
index 5656f13b0..0e9e87ba9 100644
--- a/action-src/src/action.test.ts
+++ b/action-src/src/action.test.ts
@@ -37,7 +37,6 @@ describe('Validate Action', () => {
         ${'missing config'}             | ${'bad_params/missing_config.json'}             | ${new AppError('Bad Configuration.')}
         ${'bad inline'}                 | ${'bad_params/bad_inline.json'}                 | ${new AppError('Bad Configuration.')}
         ${'bad_incremental_files_only'} | ${'bad_params/bad_incremental_files_only.json'} | ${new AppError('Bad Configuration.')}
-        ${'bad_unsupported_event'}      | ${'bad_params/bad_unsupported_event.json'}      | ${new AppError("Unsupported event: 'fork'")}
         ${'bad strict'}                 | ${'bad_params/bad_strict.json'}                 | ${new AppError('Bad Configuration.')}
     `(
         '$test',
@@ -94,16 +93,17 @@ describe('Validate Action', () => {
     );
 
     test.each`
-        files                       | expected
-        ${'fixtures/sampleCode/**'} | ${false}
+        files                       | incremental | contextFile                                | expected
+        ${'fixtures/sampleCode/**'} | ${false}    | ${'pull_request_with_files.json'}          | ${false}
+        ${'fixtures/sampleCode/**'} | ${true}     | ${'bad_params/bad_unsupported_event.json'} | ${true}
     `(
         'check files with issues $files',
-        async ({ files, expected }) => {
+        async ({ files, incremental, contextFile, expected }) => {
             const warnings: string[] = [];
             spyWarn.mockImplementation((msg: string) => warnings.push(msg));
-            const context = createContextFromFile('pull_request_with_files.json', {
+            const context = createContextFromFile(contextFile, {
                 INPUT_FILES: files,
-                INPUT_INCREMENTAL_FILES_ONLY: 'false',
+                INPUT_INCREMENTAL_FILES_ONLY: incremental ? 'true' : 'false',
             });
             const octokit = createOctokit();
             await expect(action(context, octokit)).resolves.toBe(expected);
diff --git a/action-src/src/action.ts b/action-src/src/action.ts
index 1d175d5fe..47e84456b 100644
--- a/action-src/src/action.ts
+++ b/action-src/src/action.ts
@@ -5,7 +5,6 @@ import { RunResult } from 'cspell';
 import * as glob from 'cspell-glob';
 import * as path from 'path';
 import { ActionParams, validateActionParams } from './ActionParams';
-import { AppError } from './error';
 import { getActionParams } from './getActionParams';
 import { fetchFilesForCommits, getPullRequestFiles } from './github';
 import { CSpellReporterForGithubAction } from './reporter';
@@ -19,7 +18,7 @@ interface Context {
 }
 
 type EventNames = 'push' | 'pull_request';
-const supportedEvents = new Set<EventNames | string>(['push', 'pull_request']);
+const supportedIncrementalEvents = new Set<EventNames | string>(['push', 'pull_request']);
 
 async function gatherPullRequestFiles(context: Context): Promise<Set<string>> {
     const { github, githubContext } = context;
@@ -83,7 +82,7 @@ function friendlyEventName(eventName: EventNames | string): string {
 }
 
 function isSupportedEvent(eventName: EventNames | string): eventName is EventNames {
-    return supportedEvents.has(eventName);
+    return supportedIncrementalEvents.has(eventName);
 }
 
 async function gatherFilesFromContext(context: Context): Promise<Set<string>> {
@@ -132,12 +131,20 @@ function filterFiles(globPattern: string, files: Set<string>): Set<string> {
     return matchingFiles;
 }
 
+/**
+ * Run the action based upon the githubContext.
+ * @param githubContext
+ * @param octokit
+ * @returns a promise that resolves to `true` if no issues were found.
+ */
 export async function action(githubContext: GitHubContext, octokit: Octokit): Promise<boolean> {
     const params = getActionParams();
     validateActionParams(params, core.error);
     const eventName = githubContext.eventName;
     if (params.incremental_files_only === 'true' && !isSupportedEvent(eventName)) {
-        throw new AppError(`Unsupported event: '${eventName}'`);
+        params.files = params.files || '**';
+        core.warning('Unable to determine which files have changed, checking files: ' + params.files);
+        params.incremental_files_only = 'false';
     }
     const context: Context = {
         githubContext,
diff --git a/action/lib/action.js b/action/lib/action.js
index f2e4cd802..d8c0d91fd 100644
--- a/action/lib/action.js
+++ b/action/lib/action.js
@@ -28,12 +28,11 @@ const core = __importStar(require("@actions/core"));
 const glob = __importStar(require("cspell-glob"));
 const path = __importStar(require("path"));
 const ActionParams_1 = require("./ActionParams");
-const error_1 = require("./error");
 const getActionParams_1 = require("./getActionParams");
 const github_1 = require("./github");
 const reporter_1 = require("./reporter");
 const spell_1 = require("./spell");
-const supportedEvents = new Set(['push', 'pull_request']);
+const supportedIncrementalEvents = new Set(['push', 'pull_request']);
 async function gatherPullRequestFiles(context) {
     var _a;
     const { github, githubContext } = context;
@@ -82,7 +81,7 @@ function friendlyEventName(eventName) {
     }
 }
 function isSupportedEvent(eventName) {
-    return supportedEvents.has(eventName);
+    return supportedIncrementalEvents.has(eventName);
 }
 async function gatherFilesFromContext(context) {
     if (context.useEventFiles) {
@@ -121,12 +120,20 @@ function filterFiles(globPattern, files) {
     }
     return matchingFiles;
 }
+/**
+ * Run the action based upon the githubContext.
+ * @param githubContext
+ * @param octokit
+ * @returns a promise that resolves to `true` if no issues were found.
+ */
 async function action(githubContext, octokit) {
     const params = (0, getActionParams_1.getActionParams)();
     (0, ActionParams_1.validateActionParams)(params, core.error);
     const eventName = githubContext.eventName;
     if (params.incremental_files_only === 'true' && !isSupportedEvent(eventName)) {
-        throw new error_1.AppError(`Unsupported event: '${eventName}'`);
+        params.files = params.files || '**';
+        core.warning('Unable to determine which files have changed, checking files: ' + params.files);
+        params.incremental_files_only = 'false';
     }
     const context = {
         githubContext,