diff --git a/src/PdfParser/Type/PdfDictionary.php b/src/PdfParser/Type/PdfDictionary.php
index 15fbc98..62393f0 100644
--- a/src/PdfParser/Type/PdfDictionary.php
+++ b/src/PdfParser/Type/PdfDictionary.php
@@ -74,7 +74,8 @@ public static function parse(Tokenizer $tokenizer, StreamReader $streamReader, P
                 break;
             }
 
-            $entries[$key->value] = $value;
+            // ensure unique entries
+            $entries[PdfName::escape(PdfName::unescape($key->value))] = $value;
         }
 
         $v = new self();
diff --git a/src/PdfParser/Type/PdfName.php b/src/PdfParser/Type/PdfName.php
index 8e3a557..4da35e8 100644
--- a/src/PdfParser/Type/PdfName.php
+++ b/src/PdfParser/Type/PdfName.php
@@ -49,11 +49,33 @@ public static function unescape($value)
             return $value;
         }
 
-        return \preg_replace_callback('/#([a-fA-F\d]{2})/', function ($matches) {
+        return \preg_replace_callback('/#([a-fA-F\d]{2})/', static function ($matches) {
             return \chr(\hexdec($matches[1]));
         }, $value);
     }
 
+    /**
+     * Escapes a name string.
+     *
+     * @param string $value
+     * @return string
+     */
+    public static function escape(string $value): string
+    {
+        $pattern = '/[\x00-\x21\x7E-\xFF()<>\[\]{}\/%#]/';
+        if (!\preg_match($pattern, $value)) {
+            return $value;
+        }
+
+        return \preg_replace_callback(
+            $pattern,
+            static function ($matches) {
+                return '#' . \substr('00' . \dechex(\ord($matches[0])), -2);
+            },
+            $value
+        );
+    }
+
     /**
      * Helper method to create an instance.
      *
diff --git a/tests/functional/FpdiTraitTest.php b/tests/functional/FpdiTraitTest.php
index ccbfbde..36141a5 100644
--- a/tests/functional/FpdiTraitTest.php
+++ b/tests/functional/FpdiTraitTest.php
@@ -320,6 +320,22 @@ public function writePdfTypeProvider()
                 "AnyToken\n" .
                 "endobj\n"
             ],
+            [
+                PdfDictionary::create(['A B' => PdfName::create('A B')]),
+                "<</A B /A B >>\n" // invalid structure but correct behavior
+            ],
+            [
+                PdfDictionary::create(['A B' => PdfName::create(PdfName::escape('A B'))]),
+                "<</A B /A#20B >>\n" // invalid structure but correct behavior
+            ],
+            [
+                PdfDictionary::create([PdfName::escape('A B') => PdfName::create(PdfName::escape('A B'))]),
+                "<</A#20B /A#20B >>\n"
+            ],
+            [
+                PdfDictionary::create(['#41' => PdfName::create('#41')]),
+                "<</#41 /#41 >>\n"
+            ],
         ];
     }
 
diff --git a/tests/functional/PdfParser/Type/PdfDictionaryTest.php b/tests/functional/PdfParser/Type/PdfDictionaryTest.php
index a6a966a..804b5bf 100644
--- a/tests/functional/PdfParser/Type/PdfDictionaryTest.php
+++ b/tests/functional/PdfParser/Type/PdfDictionaryTest.php
@@ -5,6 +5,7 @@
 use PHPUnit\Framework\TestCase;
 use setasign\Fpdi\PdfParser\PdfParser;
 use setasign\Fpdi\PdfParser\StreamReader;
+use setasign\Fpdi\PdfParser\Type\PdfArray;
 use setasign\Fpdi\PdfParser\Type\PdfDictionary;
 use setasign\Fpdi\PdfParser\Type\PdfHexString;
 use setasign\Fpdi\PdfParser\Type\PdfName;
@@ -113,7 +114,29 @@ public function parseProvider()
                     'A' => PdfName::create('B')
                 ])
             ],
-            // @todo
+            [
+                '/A 123/#41 321>>',
+                PdfDictionary::create([
+                    'A' => PdfNumeric::create(321)
+                ])
+            ],
+            [
+                '/#41 123/A 321>>',
+                PdfDictionary::create([
+                    'A' => PdfNumeric::create(321)
+                ])
+            ],
+            [
+                '/Rect [1 2 3 4]/Re#63t[5 6 7 8]>>',
+                PdfDictionary::create([
+                    'Rect' => PdfArray::create([
+                        PdfNumeric::create(5),
+                        PdfNumeric::create(6),
+                        PdfNumeric::create(7),
+                        PdfNumeric::create(8),
+                    ])
+                ])
+            ]
         ];
 
         return $data;