diff --git a/src/Extensions/DoctrineStatementExecuteDynamicReturnTypeExtension.php b/src/Extensions/DoctrineStatementExecuteDynamicReturnTypeExtension.php
index 63a661cab..cbad59598 100644
--- a/src/Extensions/DoctrineStatementExecuteDynamicReturnTypeExtension.php
+++ b/src/Extensions/DoctrineStatementExecuteDynamicReturnTypeExtension.php
@@ -63,7 +63,7 @@ private function inferType(MethodReflection $methodReflection, MethodCall $metho
         $parameterTypes = $scope->getType($paramsExpr);
 
         $stmtReflection = new PdoStatementReflection();
-        $queryExpr = $stmtReflection->findPrepareQueryStringExpression($methodReflection, $methodCall);
+        $queryExpr = $stmtReflection->findPrepareQueryStringExpression($methodCall);
         if (null === $queryExpr) {
             return null;
         }
diff --git a/src/Extensions/PdoStatementExecuteTypeSpecifyingExtension.php b/src/Extensions/PdoStatementExecuteTypeSpecifyingExtension.php
index 65ec511c8..ca6541f9d 100644
--- a/src/Extensions/PdoStatementExecuteTypeSpecifyingExtension.php
+++ b/src/Extensions/PdoStatementExecuteTypeSpecifyingExtension.php
@@ -60,7 +60,7 @@ private function inferStatementType(MethodReflection $methodReflection, MethodCa
         }
 
         $stmtReflection = new PdoStatementReflection();
-        $queryExpr = $stmtReflection->findPrepareQueryStringExpression($methodReflection, $methodCall);
+        $queryExpr = $stmtReflection->findPrepareQueryStringExpression($methodCall);
         if (null === $queryExpr) {
             return null;
         }
diff --git a/src/PdoReflection/PdoStatementReflection.php b/src/PdoReflection/PdoStatementReflection.php
index 2ac7003ea..580156947 100644
--- a/src/PdoReflection/PdoStatementReflection.php
+++ b/src/PdoReflection/PdoStatementReflection.php
@@ -7,7 +7,6 @@
 use PDO;
 use PhpParser\Node\Expr;
 use PhpParser\Node\Expr\MethodCall;
-use PHPStan\Reflection\MethodReflection;
 use PHPStan\Type\Constant\ConstantArrayType;
 use PHPStan\Type\Constant\ConstantArrayTypeBuilder;
 use PHPStan\Type\Constant\ConstantIntegerType;
@@ -18,7 +17,7 @@
 
 final class PdoStatementReflection
 {
-    public function findPrepareQueryStringExpression(MethodReflection $methodReflection, MethodCall $methodCall): ?Expr
+    public function findPrepareQueryStringExpression(MethodCall $methodCall): ?Expr
     {
         $exprFinder = new ExpressionFinder();
         $queryExpr = $exprFinder->findQueryStringExpression($methodCall);
@@ -35,10 +34,8 @@ public function findPrepareQueryStringExpression(MethodReflection $methodReflect
 
     /**
      * @param PDO::FETCH* $fetchType
-     *
-     * @return Type|null
      */
-    public function getStatementResultType(Type $statementType, int $fetchType)
+    public function getStatementResultType(Type $statementType, int $fetchType): ?Type
     {
         if (!$statementType instanceof GenericObjectType) {
             return null;
@@ -50,7 +47,8 @@ public function getStatementResultType(Type $statementType, int $fetchType)
         }
 
         $resultType = $genericTypes[0];
-        if ((PDO::FETCH_NUM === $fetchType || PDO::FETCH_ASSOC === $fetchType) && $resultType instanceof ConstantArrayType) {
+        if ((PDO::FETCH_NUM === $fetchType || PDO::FETCH_ASSOC === $fetchType) &&
+            $resultType instanceof ConstantArrayType && \count($resultType->getValueTypes()) > 0) {
             $builder = ConstantArrayTypeBuilder::createEmpty();
 
             $keyTypes = $resultType->getKeyTypes();
diff --git a/src/Rules/PdoStatementExecuteMethodRule.php b/src/Rules/PdoStatementExecuteMethodRule.php
index 35981208c..f61e4da84 100644
--- a/src/Rules/PdoStatementExecuteMethodRule.php
+++ b/src/Rules/PdoStatementExecuteMethodRule.php
@@ -59,7 +59,7 @@ private function checkErrors(MethodReflection $methodReflection, MethodCall $met
     {
         $queryReflection = new QueryReflection();
         $stmtReflection = new PdoStatementReflection();
-        $queryExpr = $stmtReflection->findPrepareQueryStringExpression($methodReflection, $methodCall);
+        $queryExpr = $stmtReflection->findPrepareQueryStringExpression($methodCall);
 
         if (null === $queryExpr) {
             return [];