Prevent crash when getting callerName (#120)

* Prevent crash when getting callerName

* Code cleanup

* Added change log

Author: marcw

Changelog.md

@@ -4,6 +4,12 @@ The change log describes what is "Added", "Removed", "Changed" or "Fixed" betwee
 
 ## UNRELEASED
 
+## 1.7.1
+
+### Fixed
+
+- Error when getting caller name with the `FlashMessage` extractor.
+
 ## 1.7.0
 
 ### Added

src/Visitor/Php/Symfony/FlashMessage.php

@@ -35,6 +35,12 @@ public function enterNode(Node $node)
         }
 
         $name = (string) $node->name;
+
+        // This prevents dealing with some fatal edge cases when getting the callerName
+        if (!in_array($name, ['addFlash', 'add'])) {
+            return;
+        }
+
         $caller = $node->var;
         // $caller might be "Node\Expr\New_"
         $callerName = isset($caller->name) ? (string) $caller->name : '';