diff --git a/l10n_br_account/models/account_invoice_line.py b/l10n_br_account/models/account_invoice_line.py
index acdbd27ffb22..d9ec307799b8 100644
--- a/l10n_br_account/models/account_invoice_line.py
+++ b/l10n_br_account/models/account_invoice_line.py
@@ -233,11 +233,14 @@ def write(self, values):
 
     @api.multi
     def unlink(self):
+        dummy_doc_line_id = self.env.ref(
+            'l10n_br_fiscal.fiscal_document_line_dummy').id
         unlink_fiscal_lines = self.env['l10n_br_fiscal.document.line']
         for inv_line in self:
             if not inv_line.exists():
                 continue
-            unlink_fiscal_lines |= inv_line.fiscal_document_line_id
+            if inv_line.fiscal_document_line_id.id != dummy_doc_line_id
+                unlink_fiscal_lines |= inv_line.fiscal_document_line_id
         result = super().unlink()
         unlink_fiscal_lines.unlink()
         self.clear_caches()