diff --git a/src/Psalm/Type/Reconciler.php b/src/Psalm/Type/Reconciler.php
index d19abdf76..d9fb39867 100644
--- a/src/Psalm/Type/Reconciler.php
+++ b/src/Psalm/Type/Reconciler.php
@@ -105,7 +105,7 @@ class Reconciler
                 foreach ($new_type_part_parts as $new_type_part_part) {
                     $result_type_candidate = self::reconcileTypes(
                         $new_type_part_part,
-                        $result_type,
+                        $result_type ? clone $result_type : null,
                         $key,
                         $statements_checker,
                         $code_location && isset($referenced_var_ids[$key]) ? $code_location : null,
diff --git a/tests/SwitchTypeTest.php b/tests/SwitchTypeTest.php
index 114fa2a73..5a6e78a23 100644
--- a/tests/SwitchTypeTest.php
+++ b/tests/SwitchTypeTest.php
@@ -364,6 +364,51 @@ class SwitchTypeTest extends TestCase
                         }
                     }',
             ],
+            'switchNullable1' => [
+                '<?php
+                    function foo(?string $s) : void {
+                        switch ($s) {
+                            case "hello":
+                            case "goodbye":
+                                echo "cool";
+                                break;
+                            case "hello again":
+                                echo "cool";
+                                break;
+                        }
+                    }',
+            ],
+            'switchNullable2' => [
+                '<?php
+                    function foo(?string $s) : void {
+                        switch ($s) {
+                            case "hello":
+                                echo "cool";
+                            case "goodbye":
+                                echo "cooler";
+                                break;
+                            case "hello again":
+                                echo "cool";
+                                break;
+                        }
+                    }',
+            ],
+            'switchNullable3' => [
+                '<?php
+                    function foo(?string $s) : void {
+                        switch ($s) {
+                            case "hello":
+                                echo "cool";
+                                break;
+                            case "goodbye":
+                                echo "cool";
+                                break;
+                            case "hello again":
+                                echo "cool";
+                                break;
+                        }
+                    }',
+            ],
         ];
     }
 
diff --git a/tests/TypeReconciliationTest.php b/tests/TypeReconciliationTest.php
index 311de241f..a3021e9da 100644
--- a/tests/TypeReconciliationTest.php
+++ b/tests/TypeReconciliationTest.php
@@ -786,6 +786,17 @@ class TypeReconciliationTest extends TestCase
                         }
                     }'
             ],
+            'reconcileNullableStringWithWeakEquality' => [
+                '<?php
+                    function foo(?string $s) : void {
+                        if ($s == "hello" || $s == "goodbye") {
+                            if ($s == "hello") {
+                                echo "cool";
+                            }
+                            echo "cooler";
+                        }
+                    }',
+            ],
         ];
     }