diff --git a/.phpunit-phpstan-dba.cache b/.phpunit-phpstan-dba.cache
index db943e0b6..c5ca5fe6b 100644
--- a/.phpunit-phpstan-dba.cache
+++ b/.phpunit-phpstan-dba.cache
@@ -2349,6 +2349,11 @@ Simulated query: SELECT email, adaid FROM ada . WHERE email=\'my_other_table\' L
         )),
       ),
     ),
+    'SELECT email, adaid, gesperrt, freigabe1u1 FROM ada
+            WHERE (gesperrt=\'1\' AND freigabe1u1=1) OR (gesperrt=\'1\' AND freigabe1u1=0)' => 
+    array (
+      'error' => NULL,
+    ),
     'SELECT email, adaid, gesperrt, freigabe1u1 FROM ada  WHERE email=\'my_other_table\' LIMIT 1' => 
     array (
       'error' => NULL,
@@ -2787,6 +2792,14 @@ Simulated query: SELECT email, adaid, gesperrt, freigabe1u1 FROM ada . WHERE ema
          'code' => 1054,
       )),
     ),
+    'SELECT email, adaid, gesperrt, freigabe1u1 FROM ada WHERE asdsa=?' => 
+    array (
+      'error' => 
+      staabm\PHPStanDba\Error::__set_state(array(
+         'message' => 'You have an error in your SQL syntax; check the manual that corresponds to your MySQL/MariaDB server version for the right syntax to use near \'? LIMIT 0\' at line 1',
+         'code' => 1064,
+      )),
+    ),
     'SELECT email, adaid, gesperrt, freigabe1u1 FROM ada WHERE email = \'webmaster@example.org\'' => 
     array (
       'error' => NULL,
@@ -3017,5 +3030,13 @@ Simulated query: SELECT email, adaid, gesperrt, freigabe1u1 FROM ada . WHERE ema
     array (
       'error' => NULL,
     ),
+    'SELECT email, adaid, gesperrt, freigabe1u1 FROM ada WHERE gesperrt=?' => 
+    array (
+      'error' => 
+      staabm\PHPStanDba\Error::__set_state(array(
+         'message' => 'You have an error in your SQL syntax; check the manual that corresponds to your MySQL/MariaDB server version for the right syntax to use near \'? LIMIT 0\' at line 1',
+         'code' => 1064,
+      )),
+    ),
   ),
 );
\ No newline at end of file
diff --git a/src/QueryReflection/QueryReflection.php b/src/QueryReflection/QueryReflection.php
index 18f60d271..8a6b9bc10 100644
--- a/src/QueryReflection/QueryReflection.php
+++ b/src/QueryReflection/QueryReflection.php
@@ -7,7 +7,6 @@
 use PhpParser\Node\Expr;
 use PhpParser\Node\Expr\BinaryOp\Concat;
 use PHPStan\Analyser\Scope;
-use PHPStan\ShouldNotHappenException;
 use PHPStan\Type\Constant\ConstantArrayType;
 use PHPStan\Type\Constant\ConstantIntegerType;
 use PHPStan\Type\Constant\ConstantStringType;
@@ -249,12 +248,7 @@ public function countPlaceholders(string $queryString): int
             return $numPlaceholders;
         }
 
-        $numPlaceholders = preg_match_all(self::REGEX_PLACEHOLDER, $queryString);
-        if (false === $numPlaceholders || $numPlaceholders < 0) {
-            throw new ShouldNotHappenException();
-        }
-
-        return $numPlaceholders;
+        return \count($this->extractNamedPlaceholders($queryString));
     }
 
     /**
@@ -270,7 +264,7 @@ public function extractNamedPlaceholders(string $queryString): array
         }
 
         if (preg_match_all(self::REGEX_PLACEHOLDER, $queryString, $matches) > 0) {
-            return $matches[0];
+            return array_unique($matches[0]);
         }
 
         return [];
diff --git a/tests/data/syntax-error-in-prepared-statement.php b/tests/data/syntax-error-in-prepared-statement.php
index 88a1b7a75..8b32455c5 100644
--- a/tests/data/syntax-error-in-prepared-statement.php
+++ b/tests/data/syntax-error-in-prepared-statement.php
@@ -136,4 +136,11 @@ public function placeholderValidation(Connection $connection)
 
         $connection->preparedQuery($query, [':gesperrt' => 1]);
     }
+
+    public function samePlaceholderMultipleTimes(Connection $connection)
+    {
+        $query = 'SELECT email, adaid, gesperrt, freigabe1u1 FROM ada
+            WHERE (gesperrt=:gesperrt AND freigabe1u1=1) OR (gesperrt=:gesperrt AND freigabe1u1=0)';
+        $connection->preparedQuery($query, [':gesperrt' => 1]);
+    }
 }