diff --git a/CHANGELOG.md b/CHANGELOG.md
index 60e1e140..97c3bfe6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -22,6 +22,7 @@ This project adheres to [Semantic Versioning](https://semver.org/).
 
 ### Fixed
 
+- Fix PHP notice caused by parsing invalid color values having less than 6 charachters (#485)
 - Fix (regression) failure to parse at-rules with strict parsing (#456)
 
 ## 8.5.0
diff --git a/src/Value/Color.php b/src/Value/Color.php
index 1cf00cce..5daad412 100644
--- a/src/Value/Color.php
+++ b/src/Value/Color.php
@@ -56,12 +56,19 @@ public static function parse(ParserState $oParserState, $bIgnoreCase = false)
                         $oParserState->currentLine()
                     ),
                 ];
-            } else {
+            } elseif ($oParserState->strlen($sValue) === 6) {
                 $aColor = [
                     'r' => new Size(intval($sValue[0] . $sValue[1], 16), null, true, $oParserState->currentLine()),
                     'g' => new Size(intval($sValue[2] . $sValue[3], 16), null, true, $oParserState->currentLine()),
                     'b' => new Size(intval($sValue[4] . $sValue[5], 16), null, true, $oParserState->currentLine()),
                 ];
+            } else {
+                throw new UnexpectedTokenException(
+                    'Invalid hex color value',
+                    $sValue,
+                    'custom',
+                    $oParserState->currentLine()
+                );
             }
         } else {
             $sColorMode = $oParserState->parseIdentifier(true);
diff --git a/tests/ParserTest.php b/tests/ParserTest.php
index c5ddeb44..a48ac0e7 100644
--- a/tests/ParserTest.php
+++ b/tests/ParserTest.php
@@ -146,6 +146,8 @@ public function colorParsing()
                     'l' => new Size(220.0, '%', true, $oColor->getLineNo()),
                     'a' => new Size(0000.3, null, true, $oColor->getLineNo()),
                 ], $oColor->getColor());
+                $aColorRule = $oRuleSet->getRules('outline-color');
+                self::assertEmpty($aColorRule);
             }
         }
         foreach ($oDoc->getAllValues('color') as $sColor) {
diff --git a/tests/fixtures/colortest.css b/tests/fixtures/colortest.css
index 1c89cf41..f834aa77 100644
--- a/tests/fixtures/colortest.css
+++ b/tests/fixtures/colortest.css
@@ -9,6 +9,7 @@
 #yours {
 	background-color: hsl(220, 10%, 220%);
 	background-color: hsla(220, 10%, 220%, 0.3);
+	outline-color: #22;
 }
 
 #variables {