diff --git a/.gitignore b/.gitignore
index 3ebd08b8..aaaabf8c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,3 +4,4 @@ build/
 sftp-config.json
 coverage/
 temp/
+.idea
\ No newline at end of file
diff --git a/src/navigator.js b/src/navigator.js
index 23809e9d..9f3923df 100644
--- a/src/navigator.js
+++ b/src/navigator.js
@@ -282,7 +282,7 @@ $.extend( $.Navigator.prototype, $.EventSource.prototype, $.Viewer.prototype, /*
             bottomright;
 
         viewerSize = $.getElementSize( this.viewer.element );
-        if ( this._resizeWithViewer && !viewerSize.equals( this.oldViewerSize ) ) {
+        if ( this._resizeWithViewer && viewerSize.x && viewerSize.y && !viewerSize.equals( this.oldViewerSize ) ) {
             this.oldViewerSize = viewerSize;
 
             if ( this.maintainSizeRatio || !this.elementArea) {
diff --git a/src/viewer.js b/src/viewer.js
index a75c4ab1..f36fe020 100644
--- a/src/viewer.js
+++ b/src/viewer.js
@@ -836,7 +836,6 @@ $.extend( $.Viewer.prototype, $.EventSource.prototype, $.ControlDock.prototype,
         return this;
     },
 
-
     /**
      * @function
      * @return {Boolean}