Fix #2328 - don’t crash on unexpected divider

src/Psalm/Type/Reconciler.php

@@ -136,7 +136,7 @@ class Reconciler
 
                             $base_key = $new_base_key;
                         } else {
-                            throw new \InvalidArgumentException('Unexpected divider ' . $divider);
+                            break;
                         }
 
                         if (!$key_parts) {
@@ -598,15 +598,6 @@ class Reconciler
 
                 $base_key = $new_base_key;
             } else {
-                if ($code_location) {
-                    IssueBuffer::add(
-                        new PsalmInternalError(
-                            'Unexpected divider ' . $divider,
-                            $code_location
-                        )
-                    );
-                }
-
                 return null;
             }
         }

tests/TypeReconciliationTest.php

@@ -1507,6 +1507,16 @@ class TypeReconciliationTest extends TestCase
                         return filter_input_array(INPUT_POST) ?? [];
                     }',
             ],
+            'noCrashOnWeirdArrayKeys' => [
+                '<?php
+                    /**
+                     * @psalm-suppress MixedPropertyFetch
+                     * @psalm-suppress MixedArrayOffset
+                     */
+                    function foo(array $a, array $b) : void {
+                        if (isset($a[$b[0]->id])) {}
+                    }',
+            ],
         ];
     }