diff --git a/tests/RuleTestCase.php b/tests/RuleTestCase.php
index bc4dd39..51a99eb 100644
--- a/tests/RuleTestCase.php
+++ b/tests/RuleTestCase.php
@@ -111,7 +111,12 @@ private function autofix(string $file, array $analyserErrors): void
         $errorsByLines = [];
 
         foreach ($analyserErrors as $analyserError) {
-            $line = $analyserError->getLine() ?? -1;
+            $line = $analyserError->getLine();
+
+            if ($line === null) {
+                throw new LogicException('Error without line number: ' . $analyserError->getMessage());
+            }
+
             $errorsByLines[$line] = $analyserError;
         }