chore: rename undefined variable in shopify_log

Signed-off-by: Chinmay D. Pai <chinmaydpai@gmail.com>
diff --git a/erpnext/erpnext_integrations/doctype/shopify_log/shopify_log.py b/erpnext/erpnext_integrations/doctype/shopify_log/shopify_log.py
index 7d3f572..a2b6af9 100644
--- a/erpnext/erpnext_integrations/doctype/shopify_log/shopify_log.py
+++ b/erpnext/erpnext_integrations/doctype/shopify_log/shopify_log.py
@@ -39,7 +39,7 @@
 	if hasattr(exception, 'message'):
 		message = exception.message
 	elif hasattr(exception, '__str__'):
-		message = e.__str__()
+		message = exception.__str__()
 	else:
 		message = "Something went wrong while syncing"
 	return message