From 8f710cc37f90c394043677aa21624d518941d44d Mon Sep 17 00:00:00 2001
From: AndrolGenhald <AndrolGenhald@gmail.com>
Date: Thu, 17 Feb 2022 10:34:34 -0600
Subject: [PATCH] Fix crash when data_flow_graph is null.

---
 .../Analyzer/Statements/Expression/AssignmentAnalyzer.php      | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/Psalm/Internal/Analyzer/Statements/Expression/AssignmentAnalyzer.php b/src/Psalm/Internal/Analyzer/Statements/Expression/AssignmentAnalyzer.php
index 6746e0b9432..54ccb593688 100644
--- a/src/Psalm/Internal/Analyzer/Statements/Expression/AssignmentAnalyzer.php
+++ b/src/Psalm/Internal/Analyzer/Statements/Expression/AssignmentAnalyzer.php
@@ -988,7 +988,8 @@ public static function analyzeAssignmentRef(
 
         $context->vars_in_scope[$lhs_var_id]->parent_nodes[$lhs_node->id] = $lhs_node;
 
-        if (($stmt->var instanceof ArrayDimFetch || $stmt->var instanceof PropertyFetch)
+        if ($statements_analyzer->data_flow_graph !== null
+            && ($stmt->var instanceof ArrayDimFetch || $stmt->var instanceof PropertyFetch)
             && $stmt->var->var instanceof Variable
             && is_string($stmt->var->var->name)
         ) {