Fix XPathResult results when the result is null

composer.lock

@@ -54,16 +54,16 @@
         },
         {
             "name": "mensbeam/html-parser",
-            "version": "1.2.2",
+            "version": "1.2.3",
             "source": {
                 "type": "git",
                 "url": "https://github.com/mensbeam/HTML-Parser.git",
-                "reference": "8e087054df98703f6dda21698419508f144e2e6e"
+                "reference": "c1dc4b55ceeb5c93e14a8cc0715f501caeead506"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/mensbeam/HTML-Parser/zipball/8e087054df98703f6dda21698419508f144e2e6e",
-                "reference": "8e087054df98703f6dda21698419508f144e2e6e",
+                "url": "https://api.github.com/repos/mensbeam/HTML-Parser/zipball/c1dc4b55ceeb5c93e14a8cc0715f501caeead506",
+                "reference": "c1dc4b55ceeb5c93e14a8cc0715f501caeead506",
                 "shasum": ""
             },
             "require": {
@@ -119,9 +119,9 @@
             ],
             "support": {
                 "issues": "https://github.com/mensbeam/HTML-Parser/issues",
-                "source": "https://github.com/mensbeam/HTML-Parser/tree/1.2.2"
+                "source": "https://github.com/mensbeam/HTML-Parser/tree/1.2.3"
             },
-            "time": "2022-02-13T23:09:28+00:00"
+            "time": "2022-02-14T15:18:44+00:00"
         },
         {
             "name": "mensbeam/intl",

lib/XPathResult.php

@@ -30,7 +30,7 @@ class XPathResult implements \ArrayAccess, \Countable, \Iterator {
     protected int $_resultType;
     protected \DOMNodeList|array $storage;
 
-    protected function __get_booleanValue(): bool {
+    protected function __get_booleanValue(): ?bool {
         if ($this->_resultType !== self::BOOLEAN_TYPE) {
             throw new XPathException(XPathException::TYPE_ERROR);
         }
@@ -42,7 +42,7 @@ class XPathResult implements \ArrayAccess, \Countable, \Iterator {
         return $this->_invalidIteratorState;
     }
 
-    protected function __get_numberValue(): float {
+    protected function __get_numberValue(): ?float {
         if ($this->_resultType !== self::NUMBER_TYPE) {
             throw new XPathException(XPathException::TYPE_ERROR);
         }
@@ -54,13 +54,13 @@ class XPathResult implements \ArrayAccess, \Countable, \Iterator {
         return $this->_resultType;
     }
 
-    protected function __get_singleNodeValue(): Node {
+    protected function __get_singleNodeValue(): ?Node {
         if (!in_array($this->_resultType, [ self::ANY_UNORDERED_NODE_TYPE, self::FIRST_ORDERED_NODE_TYPE ])) {
             throw new XPathException(XPathException::TYPE_ERROR);
         }
 
         $node = $this->storage[0];
-        return $node->ownerDocument->getWrapperNode($node);
+        return ($node !== null) ? $node->ownerDocument->getWrapperNode($node) : node;
     }
 
     protected function __get_snapshotLength(): int {
@@ -71,7 +71,7 @@ class XPathResult implements \ArrayAccess, \Countable, \Iterator {
         return $this->count();
     }
 
-    protected function __get_stringValue(): string {
+    protected function __get_stringValue(): ?string {
         if ($this->_resultType !== self::STRING_TYPE) {
             throw new XPathException(XPathException::TYPE_ERROR);
         }

vendor-bin/phpunit/composer.lock

@@ -1451,16 +1451,16 @@
         },
         {
             "name": "sebastian/global-state",
-            "version": "5.0.4",
+            "version": "5.0.5",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/global-state.git",
-                "reference": "19c519631c5a511b7ed0ad64a6713fdb3fd25fe4"
+                "reference": "0ca8db5a5fc9c8646244e629625ac486fa286bf2"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/global-state/zipball/19c519631c5a511b7ed0ad64a6713fdb3fd25fe4",
-                "reference": "19c519631c5a511b7ed0ad64a6713fdb3fd25fe4",
+                "url": "https://api.github.com/repos/sebastianbergmann/global-state/zipball/0ca8db5a5fc9c8646244e629625ac486fa286bf2",
+                "reference": "0ca8db5a5fc9c8646244e629625ac486fa286bf2",
                 "shasum": ""
             },
             "require": {
@@ -1503,7 +1503,7 @@
             ],
             "support": {
                 "issues": "https://github.com/sebastianbergmann/global-state/issues",
-                "source": "https://github.com/sebastianbergmann/global-state/tree/5.0.4"
+                "source": "https://github.com/sebastianbergmann/global-state/tree/5.0.5"
             },
             "funding": [
                 {
@@ -1511,7 +1511,7 @@
                     "type": "github"
                 }
             ],
-            "time": "2022-02-10T07:01:19+00:00"
+            "time": "2022-02-14T08:28:10+00:00"
         },
         {
             "name": "sebastian/lines-of-code",