diff --git a/Classes/PHPExcel/Worksheet.php b/Classes/PHPExcel/Worksheet.php
index 5271122..2073910 100644
--- a/Classes/PHPExcel/Worksheet.php
+++ b/Classes/PHPExcel/Worksheet.php
@@ -1203,6 +1203,7 @@ class PHPExcel_Worksheet implements PHPExcel_IComparable
 					}
 				}
 			}
+			else { return false; }
 		}
 
 		// Uppercase coordinate