diff --git a/CHANGELOG.md b/CHANGELOG.md
index 88f8ad6b..8d4bf4e5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 ### Added
 
 - HTML writer creates a generator meta tag - [#312](https://github.com/PHPOffice/PhpSpreadsheet/issues/312) 
+- Support invalid zoom value in XLSX format - [#350](https://github.com/PHPOffice/PhpSpreadsheet/pull/350)
 
 ### Fixed
 
diff --git a/src/PhpSpreadsheet/Reader/Xlsx.php b/src/PhpSpreadsheet/Reader/Xlsx.php
index 41b8f7b5..9eddf7f1 100644
--- a/src/PhpSpreadsheet/Reader/Xlsx.php
+++ b/src/PhpSpreadsheet/Reader/Xlsx.php
@@ -702,10 +702,24 @@ class Xlsx extends BaseReader
 
                             if (isset($xmlSheet->sheetViews, $xmlSheet->sheetViews->sheetView)) {
                                 if (isset($xmlSheet->sheetViews->sheetView['zoomScale'])) {
-                                    $docSheet->getSheetView()->setZoomScale((int) ($xmlSheet->sheetViews->sheetView['zoomScale']));
+                                    $zoomScale = (int) ($xmlSheet->sheetViews->sheetView['zoomScale']);
+                                    if ($zoomScale <= 0) {
+                                        // setZoomScale will throw an Exception if the scale is less than or equals 0
+                                        // that is OK when manually creating documents, but we should be able to read all documents
+                                        $zoomScale = 100;
+                                    }
+
+                                    $docSheet->getSheetView()->setZoomScale($zoomScale);
                                 }
                                 if (isset($xmlSheet->sheetViews->sheetView['zoomScaleNormal'])) {
-                                    $docSheet->getSheetView()->setZoomScaleNormal((int) ($xmlSheet->sheetViews->sheetView['zoomScaleNormal']));
+                                    $zoomScaleNormal = (int) ($xmlSheet->sheetViews->sheetView['zoomScaleNormal']);
+                                    if ($zoomScaleNormal <= 0) {
+                                        // setZoomScaleNormal will throw an Exception if the scale is less than or equals 0
+                                        // that is OK when manually creating documents, but we should be able to read all documents
+                                        $zoomScaleNormal = 100;
+                                    }
+
+                                    $docSheet->getSheetView()->setZoomScaleNormal($zoomScaleNormal);
                                 }
                                 if (isset($xmlSheet->sheetViews->sheetView['view'])) {
                                     $docSheet->getSheetView()->setView((string) $xmlSheet->sheetViews->sheetView['view']);