diff --git a/lib/Sabberworm/CSS/CSSList/CSSList.php b/lib/Sabberworm/CSS/CSSList/CSSList.php
index d883df82..5def89a0 100644
--- a/lib/Sabberworm/CSS/CSSList/CSSList.php
+++ b/lib/Sabberworm/CSS/CSSList/CSSList.php
@@ -83,16 +83,18 @@ private static function parseListItem(ParserState $oParserState, CSSList $oList)
 			}
 			return $oAtRule;
 		} else if ($oParserState->comes('}')) {
-			$oParserState->consume('}');
-			if ($bIsRoot) {
-				if ($oParserState->getSettings()->bLenientParsing) {
-					while ($oParserState->comes('}')) $oParserState->consume('}');
-					return DeclarationBlock::parse($oParserState);
+			if (!$oParserState->getSettings()->bLenientParsing) {
+				throw new UnexpectedTokenException('CSS selector', '}', 'identifier', $oParserState->currentLine());
+			} else {
+				if ($bIsRoot) {
+					if ($oParserState->getSettings()->bLenientParsing) {
+						return DeclarationBlock::parse($oParserState);
+					} else {
+						throw new SourceException("Unopened {", $oParserState->currentLine());
+					}
 				} else {
-					throw new SourceException("Unopened {", $oParserState->currentLine());
+					return null;
 				}
-			} else {
-				return null;
 			}
 		} else {
 			return DeclarationBlock::parse($oParserState);
@@ -123,6 +125,9 @@ private static function parseAtRule(ParserState $oParserState) {
 			$oResult->setVendorKeyFrame($sIdentifier);
 			$oResult->setAnimationName(trim($oParserState->consumeUntil('{', false, true)));
 			CSSList::parseList($oParserState, $oResult);
+			if ($oParserState->comes('}')) {
+				$oParserState->consume('}');
+			}
 			return $oResult;
 		} else if ($sIdentifier === 'namespace') {
 			$sPrefix = null;
@@ -162,6 +167,9 @@ private static function parseAtRule(ParserState $oParserState) {
 			} else {
 				$oAtRule = new AtRuleBlockList($sIdentifier, $sArgs, $iIdentifierLineNum);
 				CSSList::parseList($oParserState, $oAtRule);
+				if ($oParserState->comes('}')) {
+					$oParserState->consume('}');
+				}
 			}
 			return $oAtRule;
 		}
@@ -264,6 +272,9 @@ public function removeDeclarationBlockBySelector($mSelector, $bRemoveAll = false
 		}
 		foreach ($mSelector as $iKey => &$mSel) {
 			if (!($mSel instanceof Selector)) {
+				if (!Selector::isValid($mSel)) {
+					throw new UnexpectedTokenException("Selector did not match '" . Selector::SELECTOR_VALIDATION_RX . "'.", $mSel, "custom");
+				}
 				$mSel = new Selector($mSel);
 			}
 		}
diff --git a/lib/Sabberworm/CSS/Property/Selector.php b/lib/Sabberworm/CSS/Property/Selector.php
index d84171f5..745a4b29 100644
--- a/lib/Sabberworm/CSS/Property/Selector.php
+++ b/lib/Sabberworm/CSS/Property/Selector.php
@@ -2,6 +2,8 @@
 
 namespace Sabberworm\CSS\Property;
 
+use Sabberworm\CSS\Parsing\UnexpectedTokenException;
+
 /**
  * Class representing a single CSS selector. Selectors have to be split by the comma prior to being passed into this class.
  */
@@ -35,9 +37,23 @@ class Selector {
 	))
 	/ix';
 
+	const SELECTOR_VALIDATION_RX = '/
+	^(
+		(?:
+			[a-zA-Z0-9\x{00A0}-\x{FFFF}_^$|*="\'~\[\]()\-\s\.:#+>]* # any sequence of valid unescaped characters
+			(?:\\\\.)?                                              # a single escaped character
+			(?:([\'"]).*?(?<!\\\\)\2)?                              # a quoted text like [id="example"]
+		)*
+	)$
+	/ux';
+
 	private $sSelector;
 	private $iSpecificity;
 
+	public static function isValid($sSelector) {
+		return preg_match(self::SELECTOR_VALIDATION_RX, $sSelector);
+	}
+
 	public function __construct($sSelector, $bCalculateSpecificity = false) {
 		$this->setSelector($sSelector);
 		if ($bCalculateSpecificity) {
diff --git a/lib/Sabberworm/CSS/RuleSet/DeclarationBlock.php b/lib/Sabberworm/CSS/RuleSet/DeclarationBlock.php
index 6614b1d1..08c3b0fd 100644
--- a/lib/Sabberworm/CSS/RuleSet/DeclarationBlock.php
+++ b/lib/Sabberworm/CSS/RuleSet/DeclarationBlock.php
@@ -4,6 +4,7 @@
 
 use Sabberworm\CSS\Parsing\ParserState;
 use Sabberworm\CSS\Parsing\OutputException;
+use Sabberworm\CSS\Parsing\UnexpectedTokenException;
 use Sabberworm\CSS\Property\Selector;
 use Sabberworm\CSS\Rule\Rule;
 use Sabberworm\CSS\Value\RuleValueList;
@@ -28,7 +29,33 @@ public function __construct($iLineNo = 0) {
 	public static function parse(ParserState $oParserState) {
 		$aComments = array();
 		$oResult = new DeclarationBlock($oParserState->currentLine());
-		$oResult->setSelector($oParserState->consumeUntil('{', false, true, $aComments));
+		try {
+			$aSelectorParts = array();
+			$sStringWrapperChar = false;
+			do {
+				$aSelectorParts[] = $oParserState->consume(1) . $oParserState->consumeUntil(array('{', '}', '\'', '"'), false, false, $aComments);
+				if ( in_array($oParserState->peek(), array('\'', '"')) && substr(end($aSelectorParts), -1) != "\\" ) {
+					if ( $sStringWrapperChar === false ) {
+						$sStringWrapperChar = $oParserState->peek();
+					} else if ($sStringWrapperChar == $oParserState->peek()) {
+						$sStringWrapperChar = false;
+					}
+				}
+			} while (!in_array($oParserState->peek(), array('{', '}')) || $sStringWrapperChar !== false);
+			$oResult->setSelector(implode('', $aSelectorParts));
+			if ($oParserState->comes('{')) {
+				$oParserState->consume(1);
+			}
+		} catch (UnexpectedTokenException $e) {
+			if($oParserState->getSettings()->bLenientParsing) {
+				if(!$oParserState->comes('}')) {
+					$oParserState->consumeUntil('}', false, true);
+				}
+				return false;
+			} else {
+				throw $e;
+			}
+		}
 		$oResult->setComments($aComments);
 		RuleSet::parseRuleSet($oParserState, $oResult);
 		return $oResult;
@@ -43,6 +70,9 @@ public function setSelectors($mSelector) {
 		}
 		foreach ($this->aSelectors as $iKey => $mSelector) {
 			if (!($mSelector instanceof Selector)) {
+				if (!Selector::isValid($mSelector)) {
+					throw new UnexpectedTokenException("Selector did not match '" . Selector::SELECTOR_VALIDATION_RX . "'.", $mSelector, "custom");
+				}
 				$this->aSelectors[$iKey] = new Selector($mSelector);
 			}
 		}
diff --git a/tests/Sabberworm/CSS/ParserTest.php b/tests/Sabberworm/CSS/ParserTest.php
index d9f3ec64..d7e6ce69 100644
--- a/tests/Sabberworm/CSS/ParserTest.php
+++ b/tests/Sabberworm/CSS/ParserTest.php
@@ -432,6 +432,47 @@ function testUnmatchedBracesInFile() {
 		$this->assertSame($sExpected, $oDoc->render());
 	}
 
+	function testInvalidSelectorsInFile() {
+		$oDoc = $this->parsedStructureForFile('invalid-selectors', Settings::create()->withMultibyteSupport(true));
+		$sExpected = '@keyframes mymove {from {top: 0px;}}
+#test {color: white;background: green;}
+#test {display: block;background: white;color: black;}';
+		$this->assertSame($sExpected, $oDoc->render());
+
+		$oDoc = $this->parsedStructureForFile('invalid-selectors-2', Settings::create()->withMultibyteSupport(true));
+		$sExpected = '@media only screen and (max-width: 1215px) {.breadcrumb {padding-left: 10px;}
+	.super-menu > li:first-of-type {border-left-width: 0;}
+	.super-menu > li:last-of-type {border-right-width: 0;}
+	html[dir="rtl"] .super-menu > li:first-of-type {border-left-width: 1px;border-right-width: 0;}
+	html[dir="rtl"] .super-menu > li:last-of-type {border-left-width: 0;}}
+body {background-color: red;}';
+		$this->assertSame($sExpected, $oDoc->render());
+	}
+
+	function testSelectorEscapesInFile() {
+		$oDoc = $this->parsedStructureForFile('selector-escapes', Settings::create()->withMultibyteSupport(true));
+		$sExpected = '#\# {color: red;}
+.col-sm-1\/5 {width: 20%;}';
+		$this->assertSame($sExpected, $oDoc->render());
+
+		$oDoc = $this->parsedStructureForFile('invalid-selectors-2', Settings::create()->withMultibyteSupport(true));
+		$sExpected = '@media only screen and (max-width: 1215px) {.breadcrumb {padding-left: 10px;}
+	.super-menu > li:first-of-type {border-left-width: 0;}
+	.super-menu > li:last-of-type {border-right-width: 0;}
+	html[dir="rtl"] .super-menu > li:first-of-type {border-left-width: 1px;border-right-width: 0;}
+	html[dir="rtl"] .super-menu > li:last-of-type {border-left-width: 0;}}
+body {background-color: red;}';
+		$this->assertSame($sExpected, $oDoc->render());
+	}
+
+	function testSelectorIgnoresInFile() {
+		$oDoc = $this->parsedStructureForFile('selector-ignores', Settings::create()->withMultibyteSupport(true));
+		$sExpected = '.some[selectors-may=\'contain-a-{\'] {}
+.this-selector  .valid {width: 100px;}
+@media only screen and (min-width: 200px) {.test {prop: val;}}';
+		$this->assertSame($sExpected, $oDoc->render());
+	}
+
 	/**
 	* @expectedException Sabberworm\CSS\Parsing\UnexpectedTokenException
 	*/
@@ -501,7 +542,7 @@ function testCharsetFailure2() {
 	 * @expectedException \Sabberworm\CSS\Parsing\SourceException
 	 */
 	function testUnopenedClosingBracketFailure() {
-		$this->parsedStructureForFile('unopened-close-brackets', Settings::create()->withLenientParsing(false));
+		$this->parsedStructureForFile('-unopened-close-brackets', Settings::create()->withLenientParsing(false));
 	}
 
 	/**
diff --git a/tests/files/unopened-close-brackets.css b/tests/files/-unopened-close-brackets.css
similarity index 100%
rename from tests/files/unopened-close-brackets.css
rename to tests/files/-unopened-close-brackets.css
diff --git a/tests/files/invalid-selectors-2.css b/tests/files/invalid-selectors-2.css
new file mode 100644
index 00000000..3398c62e
--- /dev/null
+++ b/tests/files/invalid-selectors-2.css
@@ -0,0 +1,33 @@
+@media only screen and (max-width: 1215px) {
+.breadcrumb{
+padding-left:10px;
+}
+.super-menu > li:first-of-type{
+border-left-width:0;
+}
+.super-menu > li:last-of-type{
+border-right-width:0;
+}
+html[dir="rtl"] .super-menu > li:first-of-type{
+border-left-width:1px;
+border-right-width:0;
+}
+html[dir="rtl"] .super-menu > li:last-of-type{
+border-left-width:0;
+}
+html[dir="rtl"] .super-menu.menu-floated > li:first-of-type
+border-right-width:0;
+}
+}
+
+
+.super-menu.menu-floated{
+border-right-width:1px;
+border-left-width:1px;
+border-color:rgb(90, 66, 66);
+border-style:dotted;
+}
+
+body {
+  background-color: red;
+}
diff --git a/tests/files/invalid-selectors.css b/tests/files/invalid-selectors.css
new file mode 100644
index 00000000..1c633c57
--- /dev/null
+++ b/tests/files/invalid-selectors.css
@@ -0,0 +1,24 @@
+@keyframes mymove {
+  from { top: 0px; }
+}
+
+#test {
+  color: white;
+  background: green;
+}
+
+body 
+  background: black;
+  }
+
+#test {
+  display: block;
+  background: red;
+  color: white;
+}
+#test {
+  display: block;
+  background: white;
+  color: black;
+}
+
diff --git a/tests/files/selector-escapes.css b/tests/files/selector-escapes.css
new file mode 100644
index 00000000..7797e06f
--- /dev/null
+++ b/tests/files/selector-escapes.css
@@ -0,0 +1,7 @@
+#\# {
+  color: red;
+}
+
+.col-sm-1\/5 {
+  width: 20%;
+}
diff --git a/tests/files/-tobedone.css b/tests/files/selector-ignores.css
similarity index 62%
rename from tests/files/-tobedone.css
rename to tests/files/selector-ignores.css
index d9fc1117..5834e009 100644
--- a/tests/files/-tobedone.css
+++ b/tests/files/selector-ignores.css
@@ -1,9 +1,13 @@
 .some[selectors-may='contain-a-{'] {
-	
+
+}
+
+.this-selector /* should remain-} */ .valid {
+  width:100px;
 }
 
 @media only screen and (min-width: 200px) {
   .test {
     prop: val;
   }
-}
\ No newline at end of file
+}