diff --git a/__tests__/ArtifactGlobber.test.ts b/__tests__/ArtifactGlobber.test.ts
index 7e510da..b2b3080 100644
--- a/__tests__/ArtifactGlobber.test.ts
+++ b/__tests__/ArtifactGlobber.test.ts
@@ -13,6 +13,18 @@ jest.mock('@actions/core', () => {
     return {warning: warnMock};
 })
 
+jest.mock('fs', () => {
+    return {
+        statSync: () => {
+            return {
+                isDirectory(): boolean {
+                    return false
+                }
+            }
+        }
+    };
+})
+
 describe("ArtifactGlobber", () => {
     beforeEach(() => {
         globMock.mockClear()
diff --git a/__tests__/ArtifactPathValidator.test.ts b/__tests__/ArtifactPathValidator.test.ts
new file mode 100644
index 0000000..9eba3a8
--- /dev/null
+++ b/__tests__/ArtifactPathValidator.test.ts
@@ -0,0 +1,60 @@
+const directoryMock = jest.fn()
+const warnMock = jest.fn()
+
+import {ArtifactPathValidator} from "../src/ArtifactPathValidator";
+
+const pattern = 'pattern'
+
+jest.mock('@actions/core', () => {
+    return {warning: warnMock};
+})
+
+jest.mock('fs', () => {
+    return {
+        statSync: () => {
+            return {isDirectory: directoryMock}
+        }
+    };
+})
+
+describe("ArtifactPathValidator", () => {
+    beforeEach(() => {
+        warnMock.mockClear()
+        directoryMock.mockClear()
+    })
+
+    it("warns and filters out path which points to a directory", () => {
+        const paths = ['path1', 'path2']
+        directoryMock.mockReturnValueOnce(true).mockReturnValueOnce(false)
+
+        const validator = new ArtifactPathValidator(false, paths, pattern)
+
+        const result = validator.validate()
+        expect(warnMock).toBeCalled()
+        expect(result).toEqual(['path2'])
+    })
+
+    it("warns when no glob results are produced and empty results shouldn't throw", () => {
+        const validator = new ArtifactPathValidator(false, [], pattern)
+        const result = validator.validate()
+        expect(warnMock).toBeCalled()
+    })
+
+    it("throws when no glob results are produced and empty results shouild throw", () => {
+        const validator = new ArtifactPathValidator(true, [], pattern)
+        expect(() => {
+            validator.validate()
+        }).toThrow()
+    })
+
+    it("throws when path points to directory", () => {
+        const paths = ['path1', 'path2']
+        directoryMock.mockReturnValueOnce(true).mockReturnValueOnce(false)
+
+        const validator = new ArtifactPathValidator(true, paths, pattern)
+
+        expect(() => {
+            validator.validate()
+        }).toThrow()
+    })
+})
\ No newline at end of file
diff --git a/__tests__/Integration.test.ts b/__tests__/Integration.test.ts
index fd00962..093d09b 100644
--- a/__tests__/Integration.test.ts
+++ b/__tests__/Integration.test.ts
@@ -70,7 +70,7 @@ describe.skip('Integration Test', () => {
     function artifacts() {
         const globber = new FileArtifactGlobber()
         const artifactPath = path.join(__dirname, 'Integration.test.ts')
-        const artifactString = `~/Desktop/test.txt,blarg.tx, ${artifactPath}`
+        const artifactString = `~/Desktop,~/Desktop/test.txt,blarg.tx, ${artifactPath}`
         return globber.globArtifactString(artifactString, "raw", false)
     }
 
diff --git a/lib/ArtifactGlobber.js b/lib/ArtifactGlobber.js
index 5eda18e..685cdc7 100644
--- a/lib/ArtifactGlobber.js
+++ b/lib/ArtifactGlobber.js
@@ -27,28 +27,34 @@ const core = __importStar(require("@actions/core"));
 const Globber_1 = require("./Globber");
 const Artifact_1 = require("./Artifact");
 const untildify_1 = __importDefault(require("untildify"));
+const ArtifactPathValidator_1 = require("./ArtifactPathValidator");
 class FileArtifactGlobber {
     constructor(globber = new Globber_1.FileGlobber()) {
         this.globber = globber;
     }
-    globArtifactString(artifact, contentType, throwsWhenNoFiles) {
+    globArtifactString(artifact, contentType, errorsFailBuild) {
         return artifact.split(',')
             .map(path => FileArtifactGlobber.expandPath(path))
-            .map(pattern => this.globPattern(pattern, throwsWhenNoFiles))
+            .map(pattern => this.globPattern(pattern, errorsFailBuild))
+            .map((globResult) => FileArtifactGlobber.validatePattern(errorsFailBuild, globResult[1], globResult[0]))
             .reduce((accumulated, current) => accumulated.concat(current))
             .map(path => new Artifact_1.Artifact(path, contentType));
     }
-    globPattern(pattern, throwsWhenNoFiles) {
+    globPattern(pattern, errorsFailBuild) {
         const paths = this.globber.glob(pattern);
         if (paths.length == 0) {
-            if (throwsWhenNoFiles) {
+            if (errorsFailBuild) {
                 FileArtifactGlobber.throwGlobError(pattern);
             }
             else {
                 FileArtifactGlobber.reportGlobWarning(pattern);
             }
         }
-        return paths;
+        return [pattern, paths];
+    }
+    static validatePattern(errorsFailBuild, paths, pattern) {
+        const validator = new ArtifactPathValidator_1.ArtifactPathValidator(errorsFailBuild, paths, pattern);
+        return validator.validate();
     }
     static reportGlobWarning(pattern) {
         core.warning(`Artifact pattern :${pattern} did not match any files`);
diff --git a/lib/ArtifactPathValidator.js b/lib/ArtifactPathValidator.js
new file mode 100644
index 0000000..a1b2ddd
--- /dev/null
+++ b/lib/ArtifactPathValidator.js
@@ -0,0 +1,58 @@
+"use strict";
+var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
+    if (k2 === undefined) k2 = k;
+    Object.defineProperty(o, k2, { enumerable: true, get: function() { return m[k]; } });
+}) : (function(o, m, k, k2) {
+    if (k2 === undefined) k2 = k;
+    o[k2] = m[k];
+}));
+var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
+    Object.defineProperty(o, "default", { enumerable: true, value: v });
+}) : function(o, v) {
+    o["default"] = v;
+});
+var __importStar = (this && this.__importStar) || function (mod) {
+    if (mod && mod.__esModule) return mod;
+    var result = {};
+    if (mod != null) for (var k in mod) if (k !== "default" && Object.prototype.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);
+    __setModuleDefault(result, mod);
+    return result;
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.ArtifactPathValidator = void 0;
+const core = __importStar(require("@actions/core"));
+const fs_1 = require("fs");
+class ArtifactPathValidator {
+    constructor(errorsFailBuild, paths, pattern) {
+        this.paths = paths;
+        this.pattern = pattern;
+        this.errorsFailBuild = errorsFailBuild;
+    }
+    validate() {
+        this.verifyPathsNotEmpty();
+        return this.paths.filter((path) => this.verifyNotDirectory(path));
+    }
+    verifyPathsNotEmpty() {
+        if (this.paths.length == 0) {
+            const message = `Artifact pattern :${this.pattern} did not match any files`;
+            this.reportError(message);
+        }
+    }
+    verifyNotDirectory(path) {
+        const isDir = fs_1.statSync(path).isDirectory();
+        if (isDir) {
+            const message = `Artifact is a directory :${path}. Directories can not be uploaded to a release.`;
+            this.reportError(message);
+        }
+        return !isDir;
+    }
+    reportError(message) {
+        if (this.errorsFailBuild) {
+            throw Error(message);
+        }
+        else {
+            core.warning(message);
+        }
+    }
+}
+exports.ArtifactPathValidator = ArtifactPathValidator;
diff --git a/src/ArtifactGlobber.ts b/src/ArtifactGlobber.ts
index 19b7a41..824a331 100644
--- a/src/ArtifactGlobber.ts
+++ b/src/ArtifactGlobber.ts
@@ -2,9 +2,10 @@ import * as core from '@actions/core';
 import {Globber, FileGlobber} from "./Globber";
 import {Artifact} from "./Artifact";
 import untildify from "untildify";
+import {ArtifactPathValidator} from "./ArtifactPathValidator";
 
 export interface ArtifactGlobber {
-    globArtifactString(artifact: string, contentType: string, throwsWhenNoFiles: boolean): Artifact[]
+    globArtifactString(artifact: string, contentType: string, errorsFailBuild: boolean): Artifact[]
 }
 
 export class FileArtifactGlobber implements ArtifactGlobber {
@@ -14,24 +15,30 @@ export class FileArtifactGlobber implements ArtifactGlobber {
         this.globber = globber
     }
 
-    globArtifactString(artifact: string, contentType: string, throwsWhenNoFiles: boolean): Artifact[] {
+    globArtifactString(artifact: string, contentType: string, errorsFailBuild: boolean): Artifact[] {
         return artifact.split(',')
             .map(path => FileArtifactGlobber.expandPath(path))
-            .map(pattern => this.globPattern(pattern, throwsWhenNoFiles))
+            .map(pattern => this.globPattern(pattern, errorsFailBuild))
+            .map((globResult) => FileArtifactGlobber.validatePattern(errorsFailBuild, globResult[1], globResult[0]))
             .reduce((accumulated, current) => accumulated.concat(current))
             .map(path => new Artifact(path, contentType))
     }
 
-    private globPattern(pattern: string, throwsWhenNoFiles: boolean): string[] {
+    private globPattern(pattern: string, errorsFailBuild: boolean): [string, string[]] {
         const paths = this.globber.glob(pattern)
         if (paths.length == 0) {
-            if (throwsWhenNoFiles) {
+            if (errorsFailBuild) {
                 FileArtifactGlobber.throwGlobError(pattern)
             } else {
                 FileArtifactGlobber.reportGlobWarning(pattern)
             }
         }
-        return paths
+        return [pattern, paths]
+    }
+
+    private static validatePattern(errorsFailBuild: boolean, paths: string[], pattern: string): string[] {
+        const validator = new ArtifactPathValidator(errorsFailBuild, paths, pattern)
+        return validator.validate()
     }
 
     private static reportGlobWarning(pattern: string) {
diff --git a/src/ArtifactPathValidator.ts b/src/ArtifactPathValidator.ts
new file mode 100644
index 0000000..d017437
--- /dev/null
+++ b/src/ArtifactPathValidator.ts
@@ -0,0 +1,43 @@
+import * as core from "@actions/core";
+import {statSync} from "fs";
+
+export class ArtifactPathValidator {
+    private readonly errorsFailBuild: boolean;
+    private paths: string[];
+    private readonly pattern: string
+    
+    constructor(errorsFailBuild: boolean, paths: string[], pattern: string) {
+        this.paths = paths;
+        this.pattern = pattern
+        this.errorsFailBuild = errorsFailBuild;
+    }
+    
+    validate(): string[] {
+        this.verifyPathsNotEmpty()
+        return this.paths.filter((path) => this.verifyNotDirectory(path))
+    }
+    
+    private verifyPathsNotEmpty() {
+        if (this.paths.length == 0) {
+            const message = `Artifact pattern:${this.pattern} did not match any files`
+            this.reportError(message)
+        }
+    }
+    
+    private verifyNotDirectory(path: string): boolean {
+        const isDir = statSync(path).isDirectory()
+        if (isDir) {
+            const message = `Artifact is a directory:${path}. Directories can not be uploaded to a release.`
+            this.reportError(message)
+        }
+        return !isDir
+    }
+    
+    private reportError(message: string) {
+        if (this.errorsFailBuild) {
+            throw Error(message)
+        } else {
+            core.warning(message)
+        }
+    }
+}
\ No newline at end of file