nodejs
diff --git a/‎lib/internal/util/inspect.js‎
Lines changed: 2 additions & 1 deletion b/‎lib/internal/util/inspect.js‎
Lines changed: 2 additions & 1 deletion
diff --git a/‎test/parallel/test-util-inspect.js‎
Lines changed: 6 additions & 0 deletions b/‎test/parallel/test-util-inspect.js‎
Lines changed: 6 additions & 0 deletions
@@ -473,7 +473,8 @@ function stylizeWithColor(str, styleType) {
   const style = inspect.styles[styleType];
   if (style !== undefined) {
     const color = inspect.colors[style];
-    return `\u001b[${color[0]}m${str}\u001b[${color[1]}m`;
+    if (color !== undefined)
+      return `\u001b[${color[0]}m${str}\u001b[${color[1]}m`;
   }
   return str;
 }
 
@@ -2240,6 +2240,12 @@ assert.strictEqual(
     assert.deepStrictEqual(inspect.colors[bgColor], [40 + i, 49]);
     assert.deepStrictEqual(inspect.colors[`${bgColor}Bright`], [100 + i, 49]);
   });
+
+  // Unknown colors are handled gracefully:
+  const stringStyle = inspect.styles.string;
+  inspect.styles.string = 'UNKNOWN';
+  assert.strictEqual(inspect('foobar', { colors: true }), "'foobar'");
+  inspect.styles.string = stringStyle;
 }
 
 assert.strictEqual(
Original file line number	Diff line number	Diff line change
@@ -473,7 +473,8 @@ function stylizeWithColor(str, styleType) {
473	473	const style = inspect.styles[styleType];
474	474	if (style !== undefined) {
475	475	const color = inspect.colors[style];
476		- return `\u001b[${color[0]}m${str}\u001b[${color[1]}m`;
	476	+ if (color !== undefined)
	477	+ return `\u001b[${color[0]}m${str}\u001b[${color[1]}m`;
477	478	}
478	479	return str;
479	480	}