diff --git a/src/HTMLValidatorCommand.ts b/src/HTMLValidatorCommand.ts
index 1926869..90ac418 100644
--- a/src/HTMLValidatorCommand.ts
+++ b/src/HTMLValidatorCommand.ts
@@ -184,10 +184,17 @@ export class HTMLValidatorCommand extends Command {
                   row.push(chalk.red(message.type))
                 }
                 row.push(message.message)
-                if (message.extract != null) {
+                if (
+                  message.extract != null &&
+                  message.lastLine != null &&
+                  message.firstColumn != null &&
+                  message.lastColumn != null
+                ) {
                   row.push(
                     `line: ${message.lastLine}, column: ${message.firstColumn}-${message.lastColumn}`,
                   )
+                } else {
+                  row.push("")
                 }
                 messagesTable.push(row)
               }
diff --git a/src/__test__/HTMLValidatorCommand.test.ts b/src/__test__/HTMLValidatorCommand.test.ts
index 12cdc3c..2b0f7b4 100644
--- a/src/__test__/HTMLValidatorCommand.test.ts
+++ b/src/__test__/HTMLValidatorCommand.test.ts
@@ -52,8 +52,8 @@ await test("html-w3c-validator", async (t) => {
     "succeeds and validate the html correctly (example without working directory)",
     async () => {
       const logs: string[] = []
-      sinon.stub(console, "log").value((log: string) => {
-        logs.push(log)
+      sinon.stub(console, "log").value((...log: string[]) => {
+        logs.push(...log)
       })
       const consoleLogSpy = sinon.spy(console, "log")
       const stream = new PassThrough()
@@ -63,7 +63,7 @@ await test("html-w3c-validator", async (t) => {
         stderr: stream,
       })
       stream.end()
-      assert.strictEqual(exitCode, 0)
+      assert.strictEqual(exitCode, 0, logs.join("\n"))
       assert.strictEqual(
         consoleLogSpy.calledWith(
           logSymbols.success,
@@ -88,8 +88,8 @@ await test("html-w3c-validator", async (t) => {
     async () => {
       const workingDirectory = path.join(FIXTURES_PATH, "success")
       const logs: string[] = []
-      sinon.stub(console, "log").value((log: string) => {
-        logs.push(log)
+      sinon.stub(console, "log").value((...log: string[]) => {
+        logs.push(...log)
       })
       const consoleLogSpy = sinon.spy(console, "log")
       const stream = new PassThrough()
@@ -102,7 +102,7 @@ await test("html-w3c-validator", async (t) => {
         },
       )
       stream.end()
-      assert.strictEqual(exitCode, 0)
+      assert.strictEqual(exitCode, 0, logs.join("\n"))
       assert.strictEqual(
         consoleLogSpy.calledWith(logSymbols.success, "./build/index.html"),
         true,
@@ -116,6 +116,53 @@ await test("html-w3c-validator", async (t) => {
     },
   )
 
+  await t.test(
+    "fails by validating the html correctly with 2 errors: one with line/column, the other without (GitHub issue #6)",
+    async () => {
+      const workingDirectory = path.join(FIXTURES_PATH, "issue-6")
+      const errors: string[] = []
+      sinon.stub(console, "error").value((error: string) => {
+        errors.push(error)
+      })
+      const consoleErrorSpy = sinon.spy(console, "error")
+      const stream = new PassThrough()
+      const exitCode = await cli.run(
+        [`--current-working-directory=${workingDirectory}`],
+        {
+          stdin: process.stdin,
+          stdout: stream,
+          stderr: stream,
+        },
+      )
+      stream.end()
+      assert.strictEqual(exitCode, 1)
+      const messagesTable = [
+        [
+          chalk.red("error"),
+          "The character encoding was not declared. Proceeding using “windows-1252”.",
+          "",
+        ],
+        [
+          chalk.yellow("warning"),
+          "Consider adding a “lang” attribute to the “html” start tag to declare the language of this document.",
+          "line: 2, column: 16-7",
+        ],
+      ]
+      assert.strictEqual(
+        consoleErrorSpy.calledWith(
+          chalk.bold.red("Error:") + " HTML validation (W3C) failed!",
+        ),
+        true,
+        errors.join("\n"),
+      )
+      assert.strictEqual(
+        consoleErrorSpy.calledWith(table(messagesTable)),
+        true,
+        errors.join("\n"),
+      )
+    },
+  )
+
   await t.test("fails with not found config", async () => {
     const workingDirectory = path.join(FIXTURES_PATH, "error-config-not-found")
     const configPath = path.join(workingDirectory, CONFIG_FILE_NAME)
diff --git a/src/__test__/fixtures/issue-6/.html-w3c-validatorrc.json b/src/__test__/fixtures/issue-6/.html-w3c-validatorrc.json
new file mode 100644
index 0000000..7610224
--- /dev/null
+++ b/src/__test__/fixtures/issue-6/.html-w3c-validatorrc.json
@@ -0,0 +1,5 @@
+{
+  "$schema": "https://raw.githubusercontent.com/theoludwig/html-w3c-validator/master/schema/html-w3c-validatorrc-schema.json",
+  "files": ["./build/index.html"],
+  "severities": ["info", "warning", "error"]
+}
diff --git a/src/__test__/fixtures/issue-6/build/index.html b/src/__test__/fixtures/issue-6/build/index.html
new file mode 100644
index 0000000..af83dfd
--- /dev/null
+++ b/src/__test__/fixtures/issue-6/build/index.html
@@ -0,0 +1,12 @@
+<!DOCTYPE html>
+<title>Have We Stopped Killing Yet?</title>
+<link rel=icon href=favicon.ico>
+<link rel=stylesheet href=setup/default.css>
+<meta name=viewport content="initial-scale=1,width=device-width">
+<meta property="og:image" content="https://mirrors.meiert.org/havewestoppedkillingyet.org/media/redrum.png">
+<h1>Have We Stopped Killing Yet?</h1>
+<p><strong>No.</strong>
+<p>This is <a href=https://meiert.com/en/blog/on-taking-life/>unacceptable</a>.
+<p>We don’t need arms and armies and industrial slaughterhouses.
+<p>We need respect for life.
+<p>Everyone can <em>do something</em>. Speaking up is doing something. <a href=https://meiert.com/en/><img src=https://hell.meiert.org/core/png/meiert-logo-80x80-alt.png alt="Jens Oliver Meiert"></a>
diff --git a/src/validateHTML.ts b/src/validateHTML.ts
index e169c99..e5c9dbf 100644
--- a/src/validateHTML.ts
+++ b/src/validateHTML.ts
@@ -7,9 +7,9 @@ export interface ValidationMessage {
   subType?: "warning" | "fatal" | "internal" | "io" | "schema"
   message: string
   extract?: string
-  lastLine: number
-  firstColumn: number
-  lastColumn: number
+  lastLine?: number
+  firstColumn?: number
+  lastColumn?: number
 }
 
 export interface ValidateHTMLResult {
@@ -30,7 +30,7 @@ export const validateHTML = async (
     },
   })
   if (!response.ok) {
-    throw new Error(`Failed to validate HTML`)
+    throw new Error(response.statusText)
   }
   const result = (await response.json()) as ValidateHTMLResult
   return result